Gyokoujin

The meat, skin, liver, stomach, gills, ovaries, and fins of anko are called the "seven treasures." Almost all parts of anko can be eaten except for the bones, and the liver is rich in vitamins and the meat in collagen. The liver is full of vitamins and the meat of the fish is full of collagen. The final dish is, of course, zosui (rice porridge), and you can enjoy all the "hidden treasures of the deep sea" down to the last drop of the bottom of the pot! There is also an all-you-can-drink option for 90 minutes for an additional 2,000 yen.