Preheat oven to 375°F (190°C). Mix hoisin sauce into tomato sauce. Spread ½ cup (125 mL) tomato sauce on bottom of 9 x 13-in. (3 L) baking dish. Add meatballs and green pepper. Top with remaining ½ cup (125 mL) tomato sauce. Cover with foil and bake in preheated oven until meatballs are cooked through, approx. 20 min.
Remove foil and sprinkle with mozzarella cheese. Bake until cheese has melted, approx. 4 min.
Layer lettuce in buns. Divide meatballs and green peppers among buns. Top with tomato sauce from the bottom of the dish.
Cut each sandwich in half; serve with a cup of soup.
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