''Cha soba'' is a thin Japanese soba noodle infused with green tea or ''ocha'' or ''cha'' for short. It is made of buckwheat flour or '' soba-ko,'' wheat flour or ''komugi-ko,'' and the addition of green tea. The green tea is what gives cha soba noodles its light green color. Traditional Soba noodles are typically grey-brown in color.

The addition of green tea adds a subtle yet elegant flavor when compared side-by-side with traditional buckwheat, or soba, noodles. During the hot and humid summer months in Japan, cha soba is especially refreshing when served chilled, and the subtle flavor of green tea takes this dish to another level.

Chilled cha soba is enjoyed by dipping the noodles in a savory soy sauce and dashi-based sauce. There are several varieties of pre-made and bottled soba noodle dipping sauces available at Japanese supermarkets or Asian markets in the West. This convenience makes it very easy to prepare a Japanese noodle dish at home for a quick lunch or dinner.