Spaghetti Sauce

Ingredients

• 2 cups (475 ml) diced yellow onion
• 1 quart (950 ml) tomato puree
• 1 quart (950 ml) chopped tomatoes
• 1 cup (225 ml) dry red wine
• 3 tbsp (45 ml) tomato paste
• 6 cloves garlic, chopped
• 1-1/2 tsp (7 ml) basil
• 1/2 tsp (2 ml) oregano
• 5 tbsp (70 ml) butter
• 1/2 tsp (2 ml) black pepper
• 1/2 t red pepper flakes
• 1 lb (.5 kg) ground meat, optional (see comments)