Separate the napa cabbage leaves and wash them. Thinly slice extra firm tofu.
Begin layering the cabbage leaves, then add a layer of tofu on top. Continue layering cabbage and tofu, alternating, until you have used them up. You should end up with a "stack" of cabbage and tofu.
Hold them tightly and cut them into 3 or 4 stacks. Arrange them in a spiral or concentric circle pattern on a large and deep pot or pan.
Once your layers are arranged, place your mushrooms on top.
For the broth, combine the water, kombu (kelp), and seasonings in a pot. Heat over medium and bring to a simmer.
Then, strain the broth. Pour over the broth evenly around the layered cabbage and tofu. Add dried red chilies to cook in the broth.
Cover the pot and let it cook for about 10 minutes, or until the cabbage is tender.
As the pot is cooking, mix together the ingredients needed for the hotpot separately.
Once cooked, carefully remove the pot from the heat. You can serve directly from the pot or transfer the contents into individual bowls.
Serve with soy or/and sesame dipping sauces on the side. You can have this hotpot with a fresh bowl of steamed rice.