Authentic Bolognese Sauce - Love To Eat Italian

Ingredients

• 1 onion (medimu)
• 1 carrot
• 1 stalk celery
• ½ pound ground pork (250 g)
• ½ pound ground beef (250 g)
• 3 oz pancetta (100 g)
• 1 cup red wine (240 ml)
• 1 cup whole milk (240 ml)
• 2 tbsp tomato purée (passata di pomodoro) (30 g (or use 1 tsp tomato paste))
• 1 cup chicken stock
• 3 tbsp olive oil
• ½ stick unsalted butter (50 g)
• salt
• pepper