Sarashina Horii Azabujuban Honten is a soba restaurant in Azabujuban, Tokyo, with a 230-year history. It serves white sarashina soba made only from buckwheat hearts, along with onsoba and cold soba. Juwari soba made from 100 percent buckwheat and kamo nanban are also available. Lines form from 11 a.m., and the soba portions are small.