Drain pineapple;reserve 1/2 cup juice, Season beef with salt and pepper; shape into 24 meatballs. In skillet brown meatballs;pour off fat. Stir in soup, pineapple, celery, and soy sauce. Cover; cook over low heat 20 minutes. Blend cornstarch and pineapple juice;stir into sauce. Cook, stirring until thickened. Serve in rolls. Garnish with pimento. Makes 6 sandwiches.