I always loved Sloppy Joes when I was a kid; here is a version which sneaks in a few extra vegetables.
1 t olive oil
2 c. chopped mushrooms
1 c. chopped onion
1/4 c. chopped celery
1/2 c. chopped carrot
2 garlic cloves, minced
12 oz. ground meat (lean beef or turkey)
1/4 c. ketchup
1 T red wine vinegar
1 T Worcestershire sauce
1 8 oz. can tomato sauce
Heat oil in a deep frying pan on stove top. Add mushrooms through ground meat and saute until meat is browned. Stir in remaining ingredients, and bring to a boil. Cover, reduce heat, and simmer 20 minutes.
–Adapted from Cooking Light