Red Wine–Braised Beef Short Ribs

Ingredients

• pounds beef short ribs
• Kosher salt and freshly ground black pepper
• tablespoon vegetable or other neutral oil
• celery ribs , cut into 1/2-inch dice
• large carrots , cut into 1/2-inch dice
• large yellow onion, cut into 1/2-inch dice
• medium cloves garlic, smashed
• tablespoons tomato paste
• bottle dry red wine
• quart good-quality brown beef stock, brown chicken stock, white chicken stock, o
• packet unflavored gelatin, such as Knox , only if using store-bought stock
• sprigs fresh thyme
• bay leaves
• bottle ruby port wine
• Slurry made from 1/2 teaspoon cornstarch mixed with 1 teaspoon water