Puttanesca II

Heat oil and butter in a large saucepan over medium heat. Saute onion and garlic until onion is tender and translucent. Stir in crushed tomatoes diced tomatoes and sun-dried tomatoes. Simmer 5 minutes on medium heat. Add peppers black olives green olives and capers. Simmer 15 to 20 minutes on low heat or until sauce has thickened.