Most ANYTHING.
I shocked my DH one night by telling him the ONLY thing I remember my mom or dad cooking that was entirely fresh stuff was pot roast.
(Dh is from Africa and lived in India before coming here. His comment was WHAT did you EAT?)
Well the answer to that is I went through a phase of literally *years* where because I was "so picky" I only "liked" the following (as far as "meal foods")
--mashed potatoes (my mom made instant, with the brown gravy powder)
--canned chili
--french fries
--Cream of Wheat
I can literally remember being revolted at the idea that meat had blood in it so I would not eat meat that I knew was meat.

(I must have seen a bloody package or something. I've gotten over that.)
That is literally the only things you might find served with a meal that I ate. Of course I ate junk like sweets and Pringles. Oh and PBJ.
I ate NO fruits or veggies other than what was in the can o chili.
My mom's answer was to quit cooking basically and feed me what I liked. I don't know how or when I got a bit more expanded.
When I did 'expand" a bit I remmeber a ton of frozen TV dinners (I still wouldn't eat the corn, and I liked the fried chicken one only) frozen pizza. Hamburger helper and white bread were a staple.
I only started liking fruits and veggies basically as an adult and I think that's because my dad only ever bought green grapes, which I still don't like, and they only ever bought Red Delicious apples, which I still don't really like.
Serious *cringes* for me though
--Kool-Aid or any other 'fake' juice
--any sort of prepackaged snack cake product (always around when I was a kid)
--hydrogenated anything--margarine and hydrogenated PB get thrown out if they make it through the door.
--candy bars, they're a bad enough impact on the diet when they're going into an *adult* they don't need that sugar and huge calorie overload.
--soda, they don't even realize all restaurants have it. (they *have* occasionally gotten caffiene free or 'juice' if we're somewhere they don't have real juice and they see us getting a drink. But it's so rare that I let it go, and it's a dh thing)
My mom now lives with us and she is amazed at what my kids will eat. And we are not talking like weird stuff here, we are talking the fact that dd's favorite snacks from the fridge are fruits. (pretty much any but probably the top are apples, grapes, and oranges, the little clementines in particular cause they're easiest to peel.)
I have had to come down a bit though with DH and my mom around and pretty much realize I can only control what *I* buy the kids.....so I keep my 'treats' to favored fruits and "pop-juice" from the health food store (It is carbonated juice basically, they love it and think it is a big deal. I think it's way better than say a bag of Cheetos)