Classic Bolognese Ragù

Ingredients

• 2 tbsp olive oil
• 3 tbsp tomato paste
• ½ cup dry red wine
• 1 cup whole milk
• Kosher salt and freshly cracked black pepper
• 2 onions, finely chopped, about 1½ cups ((see notes below))
• 2 ribs celery, finely chopped, about 1 cup ((see notes below))
• 2 carrots, finely chopped, about ¾ cup ((see notes below))
• 6 oz ground beef, 85% lean ((I used ground sirloin))
• 6 oz ground pork ((could use veal instead))
• 4 oz thinly sliced pancetta, finely chopped
• 3 cups (about) chicken stock, divided
• 1 lb pasta, preferably pappardelle, tagliatelle or fettuccine
• Grated Parmesan, for serving