Prep time: 15-20 minutes Cook time: 45-50 minutes Materials: 1 box large shells (cooked according to box instructions) Mozzarella & Parmesan cheese to taste (for top) Meat Sauce Materials: 1 1/2 lb ground beef 1/2 onion chopped 2 tbsp. olive oil 28 oz. crushed tomatoes Salt and pepper to taste 1 tbsp. sugar 1 tbsp….