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Place the portable stove in the middle of the dining table and set a shallow 10-inch-wide pot on the burner. Set the table with soup bowls, chopsticks, and small strainers or skimmers, if you have them. Add small side bowls or ramekins for the dipping sauce.
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Fill a large pot with 8 cups water and the kombu and warm on your kitchen stovetop over medium-low heat to just below boiling, about 20 minutes. Remove and discard the kombu. Keep the broth warm.
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Meanwhile, arrange the vegetables, mushrooms, and greens on a large platter. Place the seafood on another platter. Pour the Ponzu Sauce into a pitcher. Place the Momiji Oroshi in a small serving bowl. Place the chives in a small serving bowl. Set them on the table.
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When you’re ready to serve, fill a 10-inch-wide pot on the portable stove with 2 1⁄2 inches of broth. Turn the heat so the broth is just below simmering. In batches, add to the pot items that take the longest to cook: cabbage, carrot, shiitakes, and leek. Once they're cooked, add some seafood to the pot of vegetables, and then the leafy greens.
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Ask guests to take a serving of dipping sauce and season it with Momiji Oroshi and chives and then invite them to pick out from the cooked food in the pot, dip it in the sauce, and eat it. Be sure to watch the pot, skim any foam from the surface, and continue to add broth, vegetables, and seafood slowly to keep the pot full and hot.