Finely chop onion, carrot, and celery.
Cut the beef into bite-sized pieces.
Add olive oil to a pan and sauté the vegetables.
Add the beef and stir-fry until the color changes.
Mix in crushed tomatoes and tomato paste.
Pour in red wine and add bay leaf, then simmer.
Season with salt and black pepper, cover, and cook on low heat.
Finish when the desired consistency is achieved.