Mushrooms are good, I get the closed cup type, the fairly big ones, chop them into 3rds and fry them (low heat) with peppers, kidney beans,,leek, corgette, onion and cherry tomatos (small type) with some lean steak mince in there, chopped tomato juice and maybe some corriander etc.
Throw in some brown rice and its a quality meal full of everything you need and next to no fat.