- Prepare the Layers: Cut napa cabbage leaves and beef slices into roughly equal sizes. Take one cabbage leaf, place a slice of beef on top, and continue layering until you’ve used them all. Stack 4 layers high, then slice the layered stack into 2- to 3-inch sections. 
- Arrange in Pot: In a large shallow pot (a shallow, wide pot works best), arrange the cut sections upright in a circular pattern, tightly packed. Tuck in mushrooms in the middle. 
- Add Broth: Pour in chicken broth and Shiro dashi, gently covering the base of the pot—no need to submerge the layers fully, just enough to steam and simmer. 
- Cook the Beef Hot Pot: Cover and bring to a boil over medium heat. Once boiling, reduce to a simmer and cook for 15 - 20 minutes until the cabbage is tender and the beef is fully cooked. 
- Make the hot pot sauce: While the hot pot simmers, mix all sauce ingredients in a small bowl until smooth and well combined. Taste and adjust seasoning as needed. 
- Serve: Carefully ladle the hot pot into individual bowls and serve with the dipping sauce on the side. Best enjoyed with rice, noodles or by itself.