Batman - Steak
Especially if Alfred cooks it (although he's admitted he loves cooking it himself).
Teenage Mutant Ninja Turtles - Pizza
Spider-Man - Aunt May's Pancakes
She calls them Wheatcakes.
Thor - Creamsicle
Wolverine - Burgers and beer
Popeye - Spinach
This should be pretty obvious. And yes, Popeye was a comic book character before he was a cartoon character.
Deadpool - Chimichangas
Superman - Beef bourguignon with ketchup
That was also one of his passwords.
Martian Manhunter - Chocos and Oreos
Iron Man - Shawarma?
I'll have to check up on that.
Galactus - Planets
Captain America - His shield