Prepare at least 1 day ahead or freeze.
Mix together sausage, eggs, and bread crumbs. Using palms of hands, shape mixture into balls the size of walnuts. Sauté in frying pan until browned on all sides. Drain into colander.
Combine catsup, brown sugar, vinegar, and soy sauce. Pour over sausage balls and simmer 30 minutes, stirring occasionally.
Serve in hot chafing dish. If balls are to be frozen, freeze in sauce. Heat slowly to thaw until hot.