Grandma's Porcupine Meatballs

Here's an old recipe from the Depression era my grandmother used to make--it's best served with mashed potatoes and some kind of green vegetable.

1 lb. hamburger
1/2 cup rice
1 egg
1/4 cup chopped onion
1/4 cup ketchup

Combine hamburger, egg, rice, and, onion. Form into meatballs and place in the bottom of a large kettle or deep frying pan. Combine ketchup with enough water to cover the meatballs and simmer on low heat until the meatballs are done and the liquid is thickened.