Polenta Cakes with Short Rib Ragu

Name: Polenta Cakes with Short Rib Ragu
Ingredients: Short Ribs:; 4 tablespoons vegetable oil; 4 pounds bone-in beef short ribs; Kosher salt; Freshly ground black pepper; 1 yellow onion, chopped; 2 carrots, peeled and chopped; 2 celery stalks, chopped; 3 garlic cloves, peeled; 1 tablespoon all-purpose flour; 2 cups red wine; 4 cups beef broth; 1 bunch fresh thyme sprigs; Polenta:; 2 cups water; 1 cup whole milk; 1 cup yellow cornmeal; 1/4 cup grated Parmesan cheese; 3 ounces cream cheese, softened; 3 tablespoons vegetable oil; 1/2 cup all-purpose flour; Fresh flat-leaf parsley, for garnish