You'd never get fat and you could eat literally anything. You could cook with any ingredient known to man, including extinct ones like wooly mammoth, or you could even eat inedible things like a door or lava and see what they taste like if edible, what texture they would have. If you had access to a simulation where you could eat or cook whatever you want, what kind of things would they be? Could be something like dawn dish soap because it'd taste like sour blue razz or smoked mammoth ribs and dodo wings because they probably taste awesome. Personally I'd like to simulate what plants taste like to cows, horses and deer. It must taste good if they eat it all day. While I'm at it I'd like to also see what dogfood and cat food tastes like for dogs and cats respectively, maybe to them it actually tastes good.