A few things I love to eat that aren't terrible for you:
1) portabella burgers
Marinate whole portabella mushroom cap in olive oil, Worcestershire sauce, garlic powder, red wine, and I even throw in a bit of A1 steak sauce into the marinade sometimes. The quantities really don't matter too much as long as you can cover the caps. I usually do 2 caps in a ziploc bag in the fridge, and flip 'em every now and then. I've done as little as 2 hours and as long as 8, doesn't make a huge difference either way.
Grill the caps just like beef. Butter and toast some burger buns on the grill. Melt a bit of cheese to the underside of the caps (facing upwards). Serve with tomato and spinach.
Yes you can have butter, cheese, and delicious flavors, and still lose weight. Just don't be too generous on the portions! This above meal is best served with sides of delicious veggies. I like to fry chopped broccoli, onions, and zucchini in olive oil and kikkoman soy sauce, with a bit of ground pepper.