This recipe is the only “PiP” (that is, in Instant Pot terminology, “pot in pot”) recipe in this book. We found that technique too fussy for a book
about getting dinner on the table straight from the freezer. However, in this
one case, our last recipe, we felt the extra step was warranted because
mahi-mahi is a thicker, meatier fish and takes longer to cook. It’s also
expensive and we wanted to make sure the fish remains moist and delicate.
When the fillets were set right on the cooker’s bottom or even in a rack,
they tended to turn mushy, given the time the pot needs to stay under
pressure to thaw and cook the fish.
Watch the size of the frozen fillets. They must lie flat in a 7-inch
baking dish.