Document:

<PAGE>

                                                                   Exhibit 10.20

                                  AMENDMENT TO
                    SECURED SENIOR SUBORDINATED NOTE DUE 2004

     THIS AMENDMENT TO SECURED SENIOR SUBORDINATED NOTE DUE 2004 is effective as
of the 1/st/ day of May 2001 (this "Amendment"), by and between OVERHILL FARMS,
INC., a Nevada corporation (the "Borrower" or the "Company"), and LEVINE
LEICHTMAN CAPITAL PARTNERS II, L.P., a California limited partnership (the
"Purchaser").

                                 R E C I T A L S
                                 - - - - - - - -

     A.   In connection with the closing of the transactions contemplated by
that certain Securities Purchase Agreement dated as of November 24, 1999, as
amended by a Consent and First Amendment to Securities Purchase Agreement dated
as of August 23, 2000 (as so amended, the "Securities Purchase Agreement"), by
and among the Company, OVERHILL CORPORATION (formerly known as Polyphase
Corporation), a Nevada corporation, OVERHILL L.C. VENTURES, INC., a California
corporation, and the Purchaser, the Company issued to the Purchaser a Secured
Senior Subordinated Note Due 2004 dated November 24, 1999, made payable to the
Purchaser in the original principal amount of $28,000,000 (the "Note"). Unless
otherwise indicated, all capitalized terms used and not otherwise defined herein
have the meanings specified in the Securities Purchase Agreement.

     B.   On or about January 12, 2001, the Company delivered to the Purchaser,
pursuant to Section 5(b) of the Note, an Excess Cash Flow Calculation
Certificate dated January 12, 2001, with respect to the Fiscal Year ended
October 1, 2000 (the "2000 ECF Certificate"). Under the 2000 ECF Certificate,
the Company was required to pay to the Purchaser, on or before January 15, 2001,
a total Excess Cash Flow payment with respect to such Fiscal Year (the "ECF
Payment") of $3,092,000. Prior to the delivery of the 2000 ECF certificate, the
Company had delivered to the Purchaser a preliminary, unexecuted Excess Flow
Calculation Certificate which demonstrated the amount due the Fiscal Year ended
October 1,2000 to be $2,020,000.

     C.   Certain claims and disputes have arisen regarding the correct amount
of the ECF Payment due to the Purchaser with respect to the Fiscal Year ended
October 1, 2000. As of January 15, 2001, the Company was ready, willing and able
to pay to the Purchaser the ECF Payment calculated under either of the ECF
Certificates. The Company attempted to pay the Purchaser the sum of $3,092,000
for the ECF Payment for the Fiscal Year ended October 1, 2000, but was precluded
from making such payment by the Senior Lender. As of the date hereof, the
Company has paid to the Purchaser the amount of $2,020,000 in respect of the ECF
Payment. The parties have agreed to settle such claims and disputes with respect
to such matters by amending the Note to increase the interest rates payable
thereunder as provided for herein. Such amendment is permitted under Section
8(b) of the Intercreditor and Subordination Agreement dated as of November 24,
1999, as amended by the First

<PAGE>

Amendment to Intercreditor and Subordination Agreement dated as of August 23,
2000, between the Purchaser and the Senior Lender.

                                A G R E E M E N T

     NOW, THEREFORE, in consideration of the foregoing and the mutual covenants,
conditions and provisions contained herein, and for other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged, the
parties hereto hereby agree as follows:

     1.   Amendment of Section 2 (Payment of Interest; Default Rate). Section 2
of the Note is hereby amended by adding the following paragraph to the end of
such Section:

            "Notwithstanding the foregoing, (A) interest on the unpaid principal
       balance of this Note shall accrue from May 1, 2001 through May 31, 2001,
       at a Base Rate equal to 14.50%, and (B) until the Purchaser receives from
       the Company an optional prepayment of principal of $1,072,000 in
       accordance with Section 4 of this Note (provided that such prepayment
       shall be made exclusive of any mandatory prepayments required to be made
       by the Company pursuant to Sections 5 or 6 of this Note or otherwise),
       effective on and as of June 1, 2001, each of the Base Rates stated in
       clauses (b), (c) and (d) of this Section 2 and the initial Default Rate
       stated in the immediately preceding paragraph shall be increased by .127%
       per annum. Effective as of the date that the Purchaser receives the
       optional prepayment referred to in clause (B) above, the increase in the
       Base Rates and the initial Default Rate provided for in clause (B) shall
       no longer apply."

     2.   No Default Conditional. So long as the Company performs its
obligations under Section 2 of the Note as amended by the amendment thereto
provided for in Section 1 of this Amendment, no Default or Event of Default
shall be deemed to have occurred as a result of the Company's failure to pay to
the Purchaser the balance of the ECF Payment due under the 2000 ECF Certificate;
provided, however, that if the Company fails to perform any such obligations,
the Company's failure to make such payment to the Purchaser shall be deemed to
be an Event of Default ab initio and the Purchaser shall be free to exercise any
or all rights, powers and remedies under the Securities Purchase Agreement, the
other Investment Documents and Applicable Law with respect thereto. The
Purchaser reserves all rights, powers and remedies available to it under the
Securities Purchase Agreement, the other Investment Documents and Applicable
Laws with respect to, and in connection with, the matters described herein.
Further, this Amendment does not constitute a waiver of any breaches, Defaults,
Events of Default or, except as expressly provided above, any forbearance or
agreement to forbear by the Purchaser of the exercise of any such rights, powers
or remedies whatsoever.

     3.   Full Force and Effect. This Amendment amends the Note effective on and
as of May 1, 2001, and the Note shall remain in full force and effect in
accordance with its terms as amended hereby. The Note, as amended by this
Amendment, and all other Investment Documents are hereby ratified and affirmed
by the Company in all respects. The

                                      -2-

<PAGE>

execution, delivery and performance of this Amendment shall not operate as a
waiver or limitation of or, except as expressly set forth herein, as an
amendment to any right, power or remedy of the Purchaser under the Note or any
other Investment Document.

     4.   Confirmation of Security. The Company hereby confirms that the
security interests granted to the Purchaser under the Security Agreement dated
as of November 24, 1999 (the "Company Security Agreement"), between the Company
and the Purchaser, and under the Patent, Trademark and Copyright Security
Agreement dated as of November 24, 1999, as amended by the First Amendment to
Patent, Trademark and Copyright Security Agreement dated as of August 23, 2000,
continue to constitute legal, valid, enforceable and perfected security
interests in the Collateral, prior in right to all other Liens (other than the
Liens in favor of the Senior Lender and Permitted Liens) and secure the due and
punctual payment, performance and observance of all Secured Obligations (as
defined in the Company Security Agreement), including, without limitation, the
obligations of the Company under the Note as amended hereby.

     5.   Governing Law; Reimbursement of Fees. In all respects, including all
matters of construction, validity and performance, this Amendment shall be
governed by, and construed and enforced in accordance with, the laws of the
State of California applicable to contracts made and performed in such state,
without regard to principles regarding choice of law or conflicts of laws. The
Company hereby confirms its obligations, including, without limitation, its
obligations under Section 8.6 of the Securities Purchase Agreement and Section
15 of the Note, to reimburse the Purchaser for all out-of-pocket costs and
expenses incurred in connection with this Amendment and certain other matters
between the Company and the Purchaser occurring prior to the execution of this
Amendment, provided that such out-of-pocket costs and expenses shall not exceed
$18,100.

     6.   Representations. The Company represents and warrants to the Purchaser
that (a) this Amendment has been duly authorized, executed and delivered by the
Company and constitutes a legal, valid and binding obligation of the Company,
enforceable against the Company in accordance with its terms, and (b) it has
obtained all consents, authorizations and approvals necessary or required to
enter into and deliver this Amendment and perform its obligations hereunder.

     7.   Change of Notice Address. Pursuant to Section 12.6 of the Securities
Purchase Agreement, this letter agreement shall constitute written notice from
one party to the other that all notices, requests, demands and other
communications under the Securities Purchase Agreement shall be given: (a) if to
the Purchaser, to the address set forth in clause (i) of such Section, with a
copy to Irell & Manella LLP (rather than Riordan & McKinzie), 1800 Avenue of the
Stars, Suite 900, Los Angeles, CA 90071, Attention: Mitchell S. Cohen, Esq.,
Telephone: (310) 203-7579, Telecopier: (310) 203-7199; and (b) if to the Company
or Overhill Ventures, to the address set forth in clause (ii) of such Section,
with a copy to Albert B. Greco, Jr., Esq. (rather than Freeman, Freeman &
Smiley, LLP), 16901 N. Dallas Parkway, Suite 230, Addison, TX 75001, Telephone:
(972) 818-7333, Telecopier: (972) 818-7343.

                                      -3-

<PAGE>

     8.   Successors and Assigns. This Amendment shall inure to the benefit of,
and be binding upon, the parties hereto and their respective successors and
permitted assigns.

     9.   Counterparts. This Amendment may be executed in any number of
counterparts and by facsimile, each of which shall be deemed an original, but
all of which taken together shall constitute one and the same instrument.

     IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
executed and delivered by their duly authorized representatives as of the date
first written above.

                         BORROWER OR COMPANY

                         OVERHILL FARMS, INC., a Nevada corporation

                         By: ____________________________________________
                             James Rudis
                             President and Chief Executive Officer

                         PURCHASER

                         LEVINE LEICHTMAN CAPITAL PARTNERS II, L.P.,
                         a California limited partnership

                         By: LLCP California Equity Partners II, L.P., a
                             California limited partnership, its General Partner

                             By:  Levine Leichtman Capital Partners, Inc., a
                                  California corporation, its General Partner

                                  By: ___________________________________
                                      Arthur E. Levine
                                      President

                                      -4-

<PAGE>

                    ACKNOWLEDGMENT AND CONSENT OF GUARANTORS

     Each of the undersigned Guarantors hereby acknowledges that it has read the
foregoing Amendment to Secured Senior Subordinated Note Due 2004 and consents to
the amendments to the Note and the other matters contained in the Amendment.
Each of the undersigned further reaffirms its obligations under the Securities
Purchase Agreement (including, without limitation, the Guaranty) and the other
Investment Documents and agrees that all such Investment Documents, as
previously amended, remain in full force and effect in accordance with their
respective terms.

                                 GUARANTORS

                                 OVERHILL CORPORATION (formerly known as
                                 Polyphase Corporation), a Nevada corporation

                                 By:______________________________________
                                      James Rudis
                                      President and Chief Executive Officer

                                 OVERHILL L.C. VENTURES, INC., a California
                                 corporation

                                 By:______________________________________
                                      James Rudis
                                      President and Chief Executive Officer

                                      -5-<PAGE>

                                                                   Exhibit 10.21

                               SECOND AMENDMENT TO
                    SECURED SENIOR SUBORDINATED NOTE DUE 2004

         THIS SECOND AMENDMENT TO SECURED SENIOR SUBORDINATED NOTE DUE 2004 is
effective as of the 11/th/ day of September 2002 (this "Amendment"), by and
between OVERHILL FARMS, INC., a Nevada corporation (the "Borrower" or the
"Company"), and LEVINE LEICHTMAN CAPITAL PARTNERS II, L.P., a California limited
partnership (the "Purchaser" or the "Holder").

                                 R E C I T A L S

         A. The Company, OVERHILL CORPORATION (formerly known as Polyphase
Corporation), a Nevada corporation, OVERHILL L.C. VENTURES, INC. and the
Purchaser entered into that certain Securities Purchase Agreement dated as of
November 24, 1999, as amended by a Consent and First Amendment to Securities
Purchase Agreement dated as of August 23, 2000, and as further amended by a
Second Amendment to Securities Purchase Agreement dated as of January 11, 2002,
a Consent and Third Amendment dated as of January 31, 2002, and a Fourth
Amendment to Securities Purchase Agreement dated as of June 28, 2002 (as so
amended, the "Original Securities Purchase Agreement"), pursuant to which, among
other things, the Company issued to the Purchaser a Secured Senior Subordinated
Note Due 2004 dated November 24, 1999, as amended by an Amendment to Secured
Senior Subordinated Note Due 2004 dated as of May 1, 2001 (as so amended, the
"Note").

         B. Concurrently herewith, the parties to the Original Securities
Purchase Agreement are entering into a Fifth Amendment to Securities Purchase
Agreement dated as of September 11, 2002 (the "Fifth Amendment"), pursuant to
which, among other things, the parties thereto are further amending the Original
Securities Purchase Agreement. The Original Securities Purchase Agreement, as
amended by such Fifth Amendment, is referred to herein as the "Securities
Purchase Agreement." Unless otherwise indicated, all capitalized terms used and
not otherwise defined herein have the meanings ascribed to them in the
Securities Purchase Agreement.

         C. It is a condition precedent to the effectiveness of the Fifth
Amendment that the parties enter into and deliver this Amendment and further
amend the Note as provided for herein.

                                A G R E E M E N T

         NOW, THEREFORE, in consideration of the foregoing and the mutual
covenants, conditions and provisions contained herein, and for other good and
valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the parties hereto hereby amend the Note as follows:

<PAGE>

   1.     Amendment of Section 2 (Payment of Interest; Default Rate). Section 2
of the Note is hereby amended by deleting such Section in its entirety and
replacing it with the following:

          "2.  Payment of Interest; Default Rate.

             So long as no Default or Event of Default shall have occurred and
      be continuing, the Borrower shall pay interest in cash on the unpaid
      principal balance of this Note at a rate per annum (the "Base Rate") equal
      to (a) for any period ending prior to September 11, 2002, the rate per
      annum provided for in this Note applicable to such period, and (b) for any
      period ending on or after September 11, 2002, thirteen and one-quarter
      percent (13.25%) until this Note is fully paid; provided, however, that
      if, based upon a full audit by the Company's independent auditors of the
      Company's consolidated financial statements for the Fiscal Year ending on
      or about September 30, 2003, the Company achieves a minimum EBITDA for
      such Fiscal Year of at least $16.0 million and, thereafter, delivers an
      Officers' Certificate to the Holder, in form and substance satisfactory to
      the Holder and signed by the President and Chief Executive Officer and
      Chief Financial Officer of the Company, certifying that the Company has
      achieved such minimum EBITDA and attaching thereto copies of such audited
      financial statements and the notes thereto (together with the independent
      auditor's opinion) and the calculation thereof, prepared in reasonable
      detail, the Base Rate will be reduced to twelve and one-half percent
      (12.50%), effective from and after the date of receipt of such Officers'
      Certificate (and attachments) by the Holder.

             Interest shall be payable monthly in arrears on the last Business
      Day of each calendar month (or portion thereof) (each an "Interest Payment
      Date"). Interest shall be computed on the basis of the actual number of
      days elapsed over a 360-day year, including the first and the last day.

             If any Default or Event of Default shall have occurred and be
      continuing, then, in addition to the rights, powers and remedies available
      to the Holder under the Securities Purchase Agreement, this Note, the
      other Investment Documents and Applicable Law, the Borrower shall pay
      interest on the unpaid principal balance of, premium, if any, and accrued
      and unpaid interest on, and other amounts owing under, this Note at a rate
      per annum (the "Default Rate") equal to the Base Rate then in effect, plus
      two percent (2.0%). The Default Rate shall begin to accrue on the date on
      which such Default or Event of Default shall be deemed to have occurred
      (as provided in the last paragraph of Section 10.1 of the Securities
      Purchase Agreement) and shall continue until such Default or Event of
      Default shall have been cured or waived."

   2.     Amendment of Section 3 (Payment of Principal). Section 3 of the Note
is hereby amended by deleting such Section in its entirety and replacing it with
the following:

              "3.  Payment of Principal. The Borrower shall pay in full the
entire outstanding principal balance of this Note, together with all premium, if

                                       -2-

<PAGE>

      any, accrued and unpaid interest and other unpaid amounts owing under this
      Note, on October 31, 2004 (the "Maturity Date")."

   3.     Amendment of Section 4 (Optional Prepayments). Clause (ii) of Section
4 of the Note is hereby amended by deleting such clause in its entirety and
replacing it with the following:

               "(ii) at 101.0% of the first $10,000,000 of principal balance
      being prepaid at any time during the period commencing after October 31,
      2002 and ending on or before October 31, 2003, and at 102.0% of any
      additional principal balance being prepaid at any time during such period;
      and".

   4.     [Intentionally Omitted].

   5.     Full Force and Effect. This Amendment amends the Note effective on and
as of the Fifth Amendment Effective Date, and the Note shall remain in full
force and effect in accordance with its terms as amended hereby. The Note, as
amended by this Amendment, and all other Investment Documents are hereby
ratified and affirmed by the Company in all respects. The execution, delivery
and performance of this Amendment shall not operate as a waiver or limitation of
or, except as expressly set forth herein, as an amendment to any right, power or
remedy of the Purchaser under the Note or any other Investment Document.

   6.     Confirmation of Security. The Company hereby confirms that the
security interests granted by the Company to the Purchaser under the Security
Agreement (Company), the Company Pledge Agreement, as amended, and the PTC
Security Agreement, as amended, continue to constitute legal, valid, enforceable
and perfected security interests in the Collateral, prior in right to all other
Liens (other than the Liens in favor of the Senior Lender and Permitted Liens)
and secure the due and punctual payment, performance and observance of all
Secured Obligations (as defined in the Security Agreement (Company)), including,
without limitation, the obligations of the Company under the Note as amended
hereby.

   7.     Governing Law. IN ALL RESPECTS, INCLUDING ALL MATTERS OF CONSTRUCTION,
VALIDITY AND PERFORMANCE, THIS AMENDMENT SHALL BE GOVERNED BY, AND CONSTRUED AND
ENFORCED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF CALIFORNIA APPLICABLE TO
CONTRACTS MADE AND PERFORMED IN SUCH STATE, WITHOUT REGARD TO PRINCIPLES
REGARDING CHOICE OF LAW OR CONFLICTS OF LAWS.

   8.     Representations. The Company represents and warrants to the Purchaser
that (a) this Amendment has been duly authorized, executed and delivered by the
Company and constitutes a legal, valid and binding obligation of the Company,
enforceable against the Company in accordance with its terms, and (b) it has
obtained all consents, authorizations and approvals necessary or required to
enter into and deliver this Amendment and perform its obligations hereunder.

   9.     Successors and Assigns. This Amendment shall inure to the benefit of,
and be binding upon, the parties hereto and their respective successors and
permitted assigns.

                                       -3-

<PAGE>

     10.  Counterparts. This Amendment may be executed in any number of
counterparts and by facsimile, each of which shall be deemed an original, but
all of which taken together shall constitute one and the same instrument.

     11.  WAIVER OF JURY TRIAL. EACH PARTY HEREBY KNOWINGLY, INTENTIONALLY AND
VOLUNTARILY, WITH AND UPON THE ADVICE OF COMPETENT COUNSEL, WAIVES, RELINQUISHES
AND FOREVER FORGOES THE RIGHT TO A TRIAL BY JURY IN ANY ACTION, SUIT OR OTHER
PROCEEDING BASED UPON, ARISING OUT OF OR IN ANY WAY RELATING TO (a) THIS
AMENDMENT, THE SECURITIES PURCHASE AGREEMENT, THE NOTE OR ANY OTHER INVESTMENT
DOCUMENT, INCLUDING ANY PRESENT OR FUTURE AMENDMENT THEREOF, OR ANY OF THE
TRANSACTIONS CONTEMPLATED BY OR RELATED THERETO, OR (b) ANY CONDUCT, ACT OR
OMISSION OF THE PARTIES OR THEIR AFFILIATES (OR ANY OF THEM) WITH RESPECT TO
THIS AMENDMENT, THE SECURITIES PURCHASE AGREEMENT, THE NOTE OR ANY OTHER
INVESTMENT DOCUMENTS, INCLUDING ANY PRESENT OR FUTURE AMENDMENT THEREOF, WHETHER
SOUNDING IN CONTRACT, TORT OR OTHERWISE, REGARDLESS OF WHICH PARTY INITIATES
SUCH ACTION, SUIT OR OTHER PROCEEDING; AND EACH PARTY HEREBY AGREES AND CONSENTS
THAT ANY SUCH ACTION, SUIT OR OTHER PROCEEDING SHALL BE DECIDED BY A COURT TRIAL
WITHOUT A JURY, AND THAT ANY PARTY MAY FILE AN ORIGINAL COUNTERPART OR A COPY OF
THIS SECTION WITH ANY COURT AS WRITTEN EVIDENCE OF THE CONSENT OF THE PARTIES TO
THE WAIVER OF ANY RIGHT THEY MIGHT OTHERWISE HAVE TO TRIAL BY JURY.

                     [REST OF PAGE INTENTIONALLY LEFT BLANK]

                                       -4-

<PAGE>

     IN WITNESS WHEREOF, Borrower has caused this Amendment to be executed and
delivered by its duly authorized representatives as of the date first written
above.

                      BORROWER OR COMPANY

                      OVERHILL FARMS, INC., a Nevada corporation

                      By:  _____________________________________________
                           James Rudis
                           President and Chief Executive Officer

                      By:  _____________________________________________
                           Richard A. Horvath
                           Vice President and Chief Financial Officer

                      PURCHASER

                      LEVINE LEICHTMAN CAPITAL PARTNERS II, L.P.,
                      a California limited partnership

                      By:  LLCP California Equity Partners II, L.P.,
                           a California limited partnership, its General Partner

                           By:  Levine Leichtman Capital Partners, Inc.,
                                a California corporation, its General Partner

                                By: ____________________________________
                                    Arthur E. Levine
                                    President

                                       -5-

<PAGE>

                    ACKNOWLEDGMENT AND CONSENT OF GUARANTORS

     Each of the undersigned Guarantors hereby acknowledges that it has read the
foregoing Second Amendment to Note and consents to the amendments to the Note
and the other matters contained in the foregoing Second Amendment. Each of the
undersigned further reaffirms its obligations under the Securities Purchase
Agreement (including, without limitation, the Guaranty) and the other Investment
Documents and agrees that all such Investment Documents, as previously amended,
remain in full force and effect in accordance with their respective terms.

                      GUARANTORS

                      OVERHILL CORPORATION (formerly known as
                      Polyphase Corporation), a Nevada corporation

                      By: ______________________________________________
                            James Rudis
                            President and Chief Executive Officer

                      OVERHILL L.C. VENTURES, INC., a California
                      corporation

                      By: ______________________________________________
                            James Rudis
                            President and Chief Executive Officer

                                       -6-

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