Juki's Short Ribs

INGREDIENTS

• 3/4 cup all-purpose flour
• 8 beef short ribs (about 6 pounds)
• Coarse salt and freshly ground pepper
• 2 tablespoons chicken fat or olive oil
• 3 1/2 tablespoons finely chopped fresh rosemary, plus more for garnish
• 2 large onions, cut into 1/2-inch pieces
• 2 large carrots, cut into 1/2-inch pieces
• 2 stalks celery, cut into 1/2-inch pieces
• 1 1/2 cups dry red wine
• 2 cups homemade or low-sodium canned beef stock, or water
• 1 teaspoon Worcestershire sauce
• Freshly grated or prepared horseradish, for serving (optional)