Finely chop onion, carrot, and celery.
Sauté onion, carrot, and celery in a pan with olive oil.
Add ground beef and ground pork, and cook thoroughly.
Add tomato paste and sauté.
Add diced tomatoes and red wine, and simmer.
Season with bay leaf, salt, and pepper.
Simmer over low heat for at least 30 minutes.