01 - Sprinkle salt and black pepper evenly over all sides of the beef short ribs.
02 - Heat a large skillet over medium-high heat. Sear the short ribs for 2 to 3 minutes per side until a deep brown crust forms. Transfer browned ribs to the slow cooker.
03 - Add chopped onion, carrots, celery, and minced garlic to the same skillet. Sauté for 3 to 4 minutes until the vegetables begin to soften. Transfer the mixture to the slow cooker.
04 - Pour beef broth and red wine into the slow cooker. Stir in tomato paste and Worcestershire sauce until fully incorporated.
05 - Nestle fresh thyme, rosemary sprigs, and bay leaves among the short ribs.
06 - Secure the lid and cook on LOW for 8 hours, or until the ribs are exceptionally tender and the meat detaches easily from the bone.
07 - Remove and discard herb sprigs and bay leaves. Skim excess fat from the surface as needed.
08 - For a thicker sauce, blend cornstarch with water and stir into the slow cooker. Switch to HIGH heat and cook for 10 to 15 minutes until thickened.
09 - Plate hot short ribs with vegetables and ladle sauce over the top.