Braised Short Ribs with Creamy Polenta

INGREDIENTS

• 3 Tbs. olive oil
• 6 lbs. meaty, bone-in, individual-cut short ribs
• 4 tsp. kosher salt
• 1 tsp. freshly ground pepper
• 1 yellow onion, chopped
• 2 carrots, diced
• 6 cloves garlic, chopped
• 1/3 cup all-purpose flour
• 2 cups hearty red wine
• 3 cups beef stock or broth
• 2 Tbs. tomato paste
• 1 Tbs. minced fresh rosemary
• 1 bay leaf
• 1 cup whole milk
• 1 1/3 cups quick-cooking polenta
• 1/2 cup freshly grated Parmigiano-Reggiano, plus more for serving