Patent ID: 7913372

Claim:
A method of forming a cooking vessel, the method comprising the steps of: a) providing a first vessel having a bottom surface surrounded by substantially upright walls which comprises an outer shell and an inner lining, the first vessel having a first portion and a second portion, the first portion being the portion thereof in which the inner lining covers an interior bottom surface of the outer shell and extends only partially upward along an interior of the outer shell and the interior of the bottom surface, the second portion being the unlined upper extent of the outer shell that is beyond the first portion, b) drawing the first vessel to reverse the inner lining to surround an exterior of the outer shell in the first portion to form a cooking vessel wherein the second portion of the outer shell first extends circumferentially outward from the inner lining and then downward, being substantially parallel to the first portion to provide an outer wall whereby a gap is formed between the outer wall formed from the second portion and an inner wall formed from the first portion, wherein the inner lining faces the gap, c) attaching a lower extent of the second portion to the bottom of the cooking vessel thereby sealing the gap formed between the first and second portions.