Meatball Sandwiches

Ingredients (21)

• 1 egg, lightly beaten
• 1/2 cup milk
• 1/2 cup dry bread crumbs
• 1/4 cup finely chopped onion
• 1/2 teaspoon salt
• 1/4 teaspoon garlic powder
• 1/4 teaspoon pepper
• 1-1/2 pounds ground beef
• BARBECUE SAUCE:
• 1 large onion, chopped
• 2 tablespoons canola oil
• 2 garlic cloves, minced
• 3 cups water
• 1 can (12 ounces) tomato paste
• 2 teaspoons salt
• 1 teaspoon sugar
• 1 teaspoon dried oregano
• 1/4 teaspoon pepper
• 1 bay leaf
• 14 submarine buns (6 inches each), split
• 1-3/4 cups shredded part-skim mozzarella cheese