In a medium mixing bowl, COMBINE beef, onion, rice, egg, salt and pepper; MIX thoroughly; FORM into 1" balls.
ARRANGE meatballs in a broiler pan, leaving room between; BROIL until browned.
PLACE browned meatballs in a small casserole dish; POUR tomatoes over top; COVER with foil.
BAKE at 350° for 45 minutes.
Per Serving (excluding unknown items): 689 Calories; 30g Fat (38.1% calories from fat); 36g Protein; 76g Carbohydrate; 15g Dietary Fiber; 191mg Cholesterol; 236mg Sodium. Exchanges: 3 Grain(Starch); 3 1/2 Lean Meat; 12 1/2 Vegetable; 3 Fat.