Braised Short Ribs with Creamy Parmesan Polenta

Name: Braised Short Ribs with Creamy Parmesan Polenta
Cook time: 3 h
Total time: 3 h
Yield: 6 servings
Ingredients: 4 1/2 lbs beef short ribs, bone-in; 3 oz Parmesan cheese; carrot; 2 sticks celery; 1 small pkg fresh thyme; 1 small pkg fresh rosemary; 1 medium yellow onion; 2 cups red wine (such as Cabernet Sauvignon); 2 cups beef broth; 9 cups chicken or vegetable broth; 2 cups polenta (cornmeal); 1/4 cup all-purpose flour; 6 tbsp butter, unsalted; 5 tsp kosher salt; 2 1/4 tsp black pepper