Drain pineapple, reserving 1/2 cup juice (discarding remaining juice or save for another use). Set the juice and pineapple aside. In a large bowl, combine the egg, bread crumbs, garlic, salt and pepper. Crumble beef over mixture and mix well. Shape into 40 meatballs.
In a nonstick skillet, brown meatballs in oil; drain. Cut green peppers into chunks. Add broth, peppers and reserved pineapple to meatballs. Bring to a boil. Reduce heat; simmer, uncovered, for 5-7 minutes.
Meanwhile, in a large bowl, combine sugar and cornstarch. Stir in the vinegar, soy sauce and reserved pineapple juice until smooth. Add to meatball mixture. Bring to a boil; cook and stir for 2 minutes or until thickened. Serve with rice. Yield: 8 servings.