Nameko soba is a Japanese noodle dish featuring buckwheat noodles (soba) served with nameko mushrooms. Nameko mushrooms (Pholiota microspora) are small, amber-brown, gelatinous mushrooms known for their slippery texture. In nameko soba, they are typically simmered in tsuyu, which is a soup base made from dashi (a stock most often made from kombu seaweed and bonito fish flakes), soy sauce, and mirin.

The combination of nameko mushrooms and soba noodles can be served either hot or cold. Hot versions include nameko mushrooms in a warm broth poured over the soba noodles in a bowl. Cold nameko soba features chilled noodles topped with nameko mushrooms and the sauce served separately for dipping or pouring.

Soba noodles themselves have been part of Japanese cuisine for centuries, with their origin dating back to the Edo period (1603-1868). Soba was considered nutritious and became popular as an affordable, filling food in both urban and rural Japan.

Nameko mushrooms are native to Japan and northeastern Asia and have been cultivated since the early 20th century. They are a common ingredient in Japanese home cooking and are valued for their unique texture.

The pairing of nameko mushrooms with soba noodles does not have an exact documented origin but reflects the Japanese culinary principle of highlighting seasonal and regional ingredients. Nameko mushrooms are typically harvested in autumn, and nameko soba is often enjoyed as a seasonal dish during this time.

Today, nameko soba is commonly found in soba specialty restaurants, casual eateries, and is also made at home. It can be purchased as an instant dish with dried noodles and preserved mushrooms in supermarkets in Japan. The dish is appreciated for its simplicity, earthy flavor, and the characteristic slippery texture of nameko mushrooms.