Immediately after cooking beef slices, scum will surface. Use the ladle to eliminate the scum (attempt not to get an excessive amount of broth with it) and clean it off during the bowl of drinking water. Repeat this all over the cooking as you see scum surfacing. In my recipe, https://bobo-shabu-and-grill48158.aioblogs.com/87169539/helping-the-others-realize-the-advantages-of-shabu-zen