About Food offers good slow cooker recipes for beef short ribs, including Savory Slow Cooker Short Ribs and Slow Cooker Short Ribs with Cider. For the former, heat 2 tablespoons extra virgin olive oil in a large skillet over medium-high heat.
Sprinkle 2 to 3 pounds boneless beef short ribs, or 4 to 5 pounds bone-in short ribs, with salt and pepper. Sear ribs in oil, browning all sides. Transfer to slow cooker. Add 1 quartered and sliced large onion, 1 peeled and diced large carrot and 3 sliced ribs celery to skillet. Cook until onions are lightly browned; transfer vegetables to slow cooker.
Bring 2 cups dry red wine and 2 cups chicken broth to boil in skillet. Boil until reduced by half, which takes about seven to nine minutes. Pour into slow cooker; add 1 large bay leaf and rosemary leaves, if desired. Cook, covered, on low for seven to nine hours.
For the latter recipe, heat 3 tablespoons olive oil over medium-high heat in large skillet. Toss 4 to 5 pounds meaty beef short ribs in a bag with 1/2 cup all-purpose flour, 1/2 teaspoon ground thyme, 1/2 teaspoon salt and 1/2 teaspoon ground black pepper. Brown short ribs on all sides in hot oil. Add 1 large coarsely chopped onion, and cook 2 minutes longer; add to slow cooker.
Whisk together 2 cups hard or non-alcoholic cider and 1 envelope gravy mix. Pour over ribs and cook, covered, on low for eight to 10 hours or on high for five hours.