Pasta In A Tomato Butter Sauce 2 Lbs Tomatoes -- chopped 6 Tablespoons Butter 1 Medium Onion -- chopped Salt -- to taste 1 Pound Spaghetti Parmesan Cheese -- to taste Cook pasta as directed. add all ingredients except cheese and pasta to pan. simmer for 30 minutes until onion is done and tomatoes have reduced. serve over pasta and top with cheese.