In a large saucepan, melt butter and saute green pepper and onion 2 minutes over medium heat. Add spaghetti sauce mix, tomato paste, and water. Bring to a boil, reduce heat and simmer 10 minutes. Stir in oregano leaves and pepper. Cook macaroni following package directions for the minimum suggested time. Drain. In 2 quart casserole combine spaghetti sauce, macaroni, tuna and a ¾ cup of the mozzarella cheese. Toss lightly to mix well. Sprinkle top with remaining mozzarella. Bake in a 350-degree oven for 20 minutes.
Yield: 6 1-cup servings