Porcupine Meatballs

1 1/2 pounds ground round
1/2 cup uncooked rice
1 egg
1 onion, chopped
Salt and pepper

Mix all ingredients and shape into balls. Put into a baking dish. Pour 1 can tomato soup mixed with 1 can water over the meatballs. Cover and bake at 350 degrees F for 1 1/2 hours. Turn once or twice during baking.