In a bowl, whisk together beef broth, red wine (if using), soy sauce, tomato paste, Worcestershire sauce, thyme, rosemary, salt, and pepper.
Pour the mixture over the short ribs in the crockpot.
Cover and cook on low for 8 hours or high for 4-5 hours, until meat is tender and falls off the bone.
If you prefer a thicker sauce, mix cornstarch and water to make a slurry. Stir it into the crockpot 30 minutes before serving and cook on high until thickened.
Serve hot with mashed potatoes or your favorite side dish.
Notes
Red wine adds depth of flavor but can be replaced with more beef broth.
Skimming excess fat off the top before serving is recommended.
Great for meal prep and tastes even better the next day.