Meatballs: Measure all ingredients into bowl. Mix well. Shape into 1 inch balls. Arrange on baking sheet. Bake at 350oF for 15 minutes.
Sweet and Sour Sauce: Stir brown sugar, cornstarch and mustard powder together in saucepan. Stir in pineapple juice. Add vinegar, ketchup, water and soy sauce. Heat and stir until it boils and thickens. Sauce can be served seperately for dipping or can be poured over meatballs to serve from chafing dish.