Soba

Soba (そば or 蕎麦) (/ˈsoʊbə/, Japanese pronunciation: [soba]) is the Japanese name for buckwheat. It usually refers to thin noodles made from buckwheat flour, or a combination of buckwheat and wheat flours (Nagano soba). They contrast to thick wheat noodles, called udon. Soba noodles are served either chilled with a dipping sauce, or in hot broth as a noodle soup.

Source: https://en.wikipedia.org/wiki/Soba