Pat the short ribs dry with paper towels, then season all sides generously with kosher salt and pepper.
5 pounds beef short ribs
Heat about 2 tablespoon of oil in a heavy bottom skillet or Dutch oven over medium-high heat. Sear the seasoned ribs on each side until golden brown, around 2-3 minutes per side. Transfer the ribs carefully to the slow cooker using tongs.
olive oil
In that same skillet, add the carrots, celery and onion. Sauté until they are softened and turning golden brown for 3-5 minutes. Stir in the garlic, tomato paste, and herbs. Let it cook for another 2 minutes.
2 carrots, 2 celery stalks, 1 large onion, 5 garlic cloves, 2 tablespoons tomato paste, 3 sprigs fresh rosemary, 3 sprigs fresh thyme
Pour ½ cup of the red wine into the skillet, scraping up any browned bits from the bottom of the pan. Let reduce for another minute or two, then carefully pour everything into the slow cooker.
2 cups dry red wine
Whisk together the remaining red wine (except for the ¼ cup reserved for the sauce), beef stock, and molasses and pour the mixture over the ribs and vegetables in the slow cooker.
2 tablespoons molasses, 2 cups beef stock
Cover the slow cooker with its lid and cook on LOW for 6-8 hours or HIGH for 4-6 hours until the meat is shreddable and fork tender.