Lasagna Bolognese

Ingredients

• 1/2 cup extra virgin olive oil
• 1 medium onion, diced
• 4 ribs celery, diced
• 2 large carrots, peeled and diced
• 1 lb. 80/20 ground beef
• 1 lb. ground pork
• 2 cups cooking wine or chicken stock*
• 2 cups whole milk
• 1 32 oz. can whole, peeled san marzano tomatoes
• 2 bay leaves (optional)
• 1 parmigiano reggiano rind (optional)
• kosher salt
• 1/2 cup unsalted butter
• 1/2 cup all purpose flour
• 4 cups whole milk, warmed
• 1 lb. uncooked lasagna pasta**
• 3 cups finely grated parmigiano reggiano, plus more for topping
• 1 Tablespoon unsalted butter