Classic Spaghetti Bolognese - Mr. Cook

Ingredients

• 1 tablespoon olive oil
• 1 large onion, finely chopped
• 2 carrots, finely chopped
• 2 celery stalks, finely chopped
• 3 cloves garlic, minced
• 500 g mixed ground meat (beef and pork)
• 800 g crushed tomatoes
• 1 bay leaf
• Salt and freshly ground black pepper to taste
• 500 g spaghetti
• Freshly grated Parmesan cheese, for serving