Mix meat, crumbs, onion, egg, salt, ginger, and milk. Shape mixture by rounded tablespoonfuls into balls. Melt shortening in large skillet; brown and cook mea tballs. Remove meatballs; keep warm. Pour fat from skillet. Mix cornstarch and sugar. Stir in reserved pineapple syrup, vinegar and soy sauce until smooth. Po ur into skillet; cook over medium heatm, stirring constantly, until mixture thi ckens and boils. Boil and stir 1 minute. Add meatballs, pineapple tidbits and g reen pepper; heat through.