Mix thoroughly beef, crumbs, onion, egg, salt, ginger and milk.
Shape mixture by rounded tablespoonfuls into balls.
Melt oil in large skillet. (I omitted the oil).
Brown and cook meatballs; remove meatballs from skillet to plate; keep warm.
Pour fat from skillet.
Mix cornstarch and sugar.
Stir in reserved pineapple syrup, vinegar and soy sauce until smooth.
Pour into skillet; cook over medium heat, stirring constantly, until mixture thickens and boils.
Boil and stir 1 minute.
Add meatballs, crushed pineapple and green pepper; heat through.
Makes 35 meatballs plus sweet and sour sauce.
Serve over hot, cooked rice.