K.L.
Anything and Everything. Once my son started eating table foods I vowed to never cater to him. He eats what we eat. End. of. Story.
Sure, there are a few things he doesn't like (like broccoli) and I don't force him to eat that stuff, but I do encourage him to try it each time I make it.
Make sure he gets a wide variety to cover all the food groups. My pediatrician recommended looking at the nutritional intake over a week rather than each individual day.