If your pork turns out tough after cooking in the Instant Pot, it's most likely because you were impatient and failed to wait for the pressure to naturally release. The secret to tender pork in the Instant Pot - regardless of cut - u003cstrongu003eis to NOT release the pressure right awayu003c/strongu003e. Failure to let the instant pot naturally release pressure can cause the meat to seize and toughen.