DS1 is 4.3 & will eat pretty much anything. He is not a fan of fruit & veg but can be persuaded to eat it, particularly mixed in with things.
Normal dinners are mostly family dinners & include: casseroles (beef, lamb, chicken, pork, sausage), cottage pie (with beef, lamb, turkey or pork mince, onions, carrots, mushrooms), curries (lamb or chicken), roasts, pasta with 5-veg sauce (tomato, onion, carrot, swede, parsnip), pasta with cheese sauce, fishcakes/fishfingers & jacket/oven chips, chicken nugget & oven chips, fish pie, meat pie (often chicken leftover from roast, in gravy, with carrots, mushrooms & onion), pasta with meatballs in tomato sauce etc
One way of getting veg into them if they like mashed potato is to mash either celeriac or swede in with the potato. They can barely taste it IME 