If you're bored of conventional beef burgers, try this:
3/4 lb ground lamb
1/4 cup feta cheese, crumbled
1 tbsp finely chopped rosemary
2 cloves garlic, finely diced
Mix all of the above in a bowl and form into patties. Cook like normal hamburgers, either on a grill or in a pan. Serve on whole wheat buns with the regular accompaniments.