Combine soy sauce, miso paste, honey, ginger, garlic, rice wine vinegar, and black pepper into a paste.
Rub this paste to the beef ribs and marinate overnight.
Season beef with salt.
Sear the beef ribs in a pan then set aside.
Add the carrots and onions and roast briefly.
Deglaze pan with some stock.
Transfer all contents of the pan to the slow cooker.
Add beef and beef stock.
Cook on low for 8 hours.
Set aside beef ribs and reduce braising liquid to make the glaze.
Brush beef with the reduced glaze before serving.