Macarrones con chorizo y tomate

Assemble these supplies:

FOR THE SAUCE:

• 3 tablespoons olive oil or other fat 
• 1 medium-sized onion, chopped 
• 3 large tomatoes, peeled and sliced 
• 1 tablespoon sugar 
• 1/4 teaspoon salt 
• 2 cups macaroni, uncooked 
• 4 ounces Gruyere or Parmesan cheese, grated 
• 4 ounces chorizo sausage, or pepperoni 
• 2 tablespoons butter 

Steps in preparation:

1. Heat the fat in a skillet. Saute the onion until it is transparent, about 5 minutes. Add the tomatoes; cook over medium heat about 15 minutes. Pass the sauce through a colander. Add sugar and salt and set aside.
2. Prepare the macaroni according to the directions on the package. Drain. Mix the tomato sauce and cheese with the macaroni in a buttered 1 1/2 quart casserole dish; reserve several tablespoons of sauce and a little cheese for topping.
3. Remove the peeling from the sausage and slice. Mix with the macaroni. Top with the remaining tomato sauce and cheese. Dot with butter. Bake in 325° preheated oven about 20 minutes.
4. SERVES 6.