Basic bolognese sauce

Ingredients

• 1 tablespoon olive oil
• 1 onion, finely chopped
• 1 celery stalk, finely chopped
• 1 carrot, peeled, finely chopped
• 50 gram sliced pancetta, finely chopped
• 2 clove garlic, crushed
• 500 gram beef mince
• 2 tablespoon tomato paste
• 1/4 cup red wine
• 410 gram can tomato purée
• 400 gram can diced tomatoes
• 2 dried bay leaves
• 1/2 teaspoon dried oregano