Donabe steamer, "Mushi Nabe", makes wonderful steamed fennel.
Donabe-steamed Fennel Soup
Slice two large bulbs of fennel into wedges and steam in the hot Mushi Nabe over medium-high heat for 15-20 minutes or until the fennel is very soft.
Transfer the fennel into a blender. Add 1.5C vegetable stock, 1T Saikyo Miso, and 1/2T shio-koji. Blend until the mixture is very smooth. Adjust the seasoning with some salt and pepper, as necessary.
Transfer the mixture into a donabe (this time, I used mini-size classic-style donabe, "Yu-kizeto") and heat until hot.
Transfer into a bowl and top with some crab meat (and drizzle some olive oil, if you like a nice oil touch). For a vegan version, you can just serve as is, and it tastes really gorgeous.
Happy donabe life.