It's called "Nabe ryoori" 窶堙遺?堙冷?堙ィ窶堙・窶堋、窶堙ィツ in Japanese.
It is similar to Korean hot pot, but the soup is different.
There are many different kind of Nabe ryoori, though.
I love it.
It's easy to prepare. No cooking, really.
And tasty!
Nice in winter.