Cold sesame noodles can refer to several different noodle dishes that can trace their roots back to Sichuan Dandanmian (担担面) and Shanghainese Ma Jiang Mian (麻醬麵). Hiyashi Tantan Udon is a chilled variation of Japanese Tantanmen that's made by serving thick udon noodles in a cold sesame broth with a spicy meat topping.