1. Heat oven to 400°F. Combine Ground Beef, bread crumbs, egg whites, water, salt and pepper in large bowl, mixing lightly but thoroughly. Shape into twelve 2-inch meatballs. Place on rack in broiler pan that has been sprayed with cooking spray. Bake in 400°F oven 18 to 20 minutes.
2. Heat pasta sauce according to package directions in medium saucepan. Add hot cooked meatballs to pasta sauce; stir to coat evenly. Divide meatballs and sauce evenly among rolls. Top evenly with giardinera.
Test Kitchen Tips Cooking times are for fresh or thoroughly thawed Ground Beef. Ground Beef should be cooked to an internal temperature of 160°F. Color is not a reliable indicator of Ground Beef doneness.