Porcupine Meat Balls

1&1/2 pounds ground beef
1/2 cup uncooked rice
1 tsp salt
1/4 tsp pepper
1/4 cup chopped onion
1 can condensed tomato soup
1/2 cup water

Combine meat, rice, salt, pepper, and onion.  Shape into small balls.  Blend soup and water; heat in pressure pan until mixture begins to simmer.  Add meat balls.  Cook at 15 lbs pressure for 10 minutes.  Release pressure normally.