Bachiko is a luxury Japanese food made from dried sea cucumber gonads, predominantly produced around the Noto Peninsula. This unique delicacy is harvested from sea cucumbers during winter, especially from January to March, when the gonads are most developed. After harvesting, the gonads are washed in seawater, arranged into triangular shapes, and sun-dried.

The name "bachiko" is derived from the plectrum (bachi) of the traditional Japanese instrument, shamisen, as the dried product resembles this plectrum. Creating one piece of bachiko requires about 10 kilograms of sea cucumbers, making the process labor-intensive and time-consuming. Consequently, bachiko is a very expensive delicacy, with a single piece costing around 5000 yen.

Bachiko is known for its intense umami and unique flavor. It is ideal for eating thinly sliced as is, or lightly grilled and enjoyed as a sake accompaniment. It can also be used to enhance the flavor of ochazuke (tea over rice) or warm sake.

Nutritionally, bachiko is very valuable, rich in protein and minerals, making it popular as a health food. Due to its rarity and distinctive taste, bachiko is considered a particularly precious element in Japanese cuisine and is cherished as a high-end dish made with great care.