Ragu Bolognese

• 5 tablespoons extra-virgin olive oil
• 3 tablespoons butter
• 1 carrot, finely diced
• 1 medium onion, diced
• 1 rib celery, finely diced
• 1 clove garlic, sliced
• 1 pound veal, ground
• 1 pound pork, ground
• 1/4 pound pancetta, ground
• 1/2 tube tomato paste
• 1 cup milk
• 1 cup dry white wine
• Kosher salt and fresh ground black pepper
• Parmigiano-Reggiano, for grating