In a measuring cup, combine all the broth ingredients. Set aside.
Peel and thinly slice the ginger into 10 slices ginger. Set aside.
Cut the napa cabbage lengthwise into quarters, do not cut the base yet because it will makes layering easier. Wash the cabbage gently and drain well. Reserve if there is leaves that fall off.
Layer the sliced beef by placing a sliced beef between each leaf. If the sliced beef longer than the cabbage, trim with a scissor and layer it to other leaf or place it in a wide leaf.
Cut the hard base of each cabbage carefully without destroying the layers, then cut each stack into 4 pieces.
Packing the layer in a 10-inch pot from the edge of the pot and work your way towards the center. Then add shimeji mushroom and shiitake mushroom in the center. Make sure to pack the pot tightly as the layers will become loose during cooking.
Tuck in the sliced ginger between the layers and pour the broth into the pot. Cover the pot with lid and cook over medium-high heat. Once boiling, reduce the heat and simmer until the cabbage is tender and the beef is cooked through, about 10 minutes. Skim off the foam and fat before serving.
Serve with ponzu sauce. Enjoy!