My DS(10) reacts badly to a lot of foods. We generally eat -

Home made fried rice (no sauce) with egg (if tolerated), ham or chicken (can get preservative free) and frozen veggies.

Mincemeat for home made rissoles and hamburgers - don't add anything to the mince. Can get preservative free. Can also make home made sausage rolls with gluten free pastry (can do homemade too)

Drumsticks and veggies and home made chips or wedges without flavoring other than salt and pepper

Chicken thighs cut into strips, rolled in gluten free bread crumbs and sprayed with oil and baked.

Flat bread is better than normal bread - kids can react to yeast. Can get rice or corn bread. Or make roti yourself.

Snacks - home made gluten free pancakes.

Get Nuttelex - it's dairy free.

Yogurt - home made Greek yogurt (make your own culture and its easy)

Frozen yogurt with some fruits in it instead of icy poles

Frozen cordial but only the preservative free stuff or use recipe above

Slices of potato, sweet potato, pumpkin and turnip sprayed with oil and baked - need to be thinly sliced, think with a Potato peeler thinness

Roast veggie salad with balsamic and feta cheese

Home made gluten free bread dough, sliced 2cm thick, roll in cheese and plait. Can also use Vegemite in them

Carrots and celery and hummus.