What is "rangpi"

Rangpi is a noodle-like Chinese dish made from wheat or rice flour. It is a specialty dish originating from the Chinese province of Shaanxi, but has now spread to many other places in China, in particular the northern and central regions. Although rangpi is served cold, they are served in every season, including winter.

New York Times' Julia Moskin describes liangpi as served at Xi'an Famous Foods as "a dish of cold noodles in a sauce that hits every possible flavor category (sweet, tangy, savory, herbal, nutty and dozens of others)."