Finely chop onion, carrot, and celery.
Season the ground beef with salt and pepper.
Add olive oil to a pan and sauté the vegetables.
Add the beef and cook until browned.
Add minced garlic and sauté together.
Add tomato purée and mix well.
Pour in red wine and add bay leaf, then simmer.
Cook the sauce over medium-low heat for 30 minutes.