Liang pi (凉皮) is a cold noodle dish from Xi’an in Shaanxi Province, China. The name translates literally to “cold skin,” referring to the thin, slippery sheets of starch that are steamed, cooled, cut into strips, and dressed in a spicy, tangy sauce. It’s one of China’s most popular street foods, eaten primarily in summer for its cooling, refreshing qualities, though it’s available year-round across the country.
How Liang Pi Is Made
The process behind liang pi is what makes it unusual. For the wheat-based version, you start by making a simple dough from flour and salt water, then submerge it in a bowl of water and knead it repeatedly. This washing process gradually separates the starch from the gluten. The starch clouds the water, turning it into a milky liquid, while the gluten stays behind as a stretchy, elastic ball. You keep washing until the water runs mostly clear.
The starchy water is left to settle, sometimes overnight. Once the starch sinks to the bottom, the excess water is poured off, leaving a thick slurry. That slurry gets ladled in thin layers onto oiled plates or trays, then steamed for a few minutes until it solidifies into translucent, flexible sheets. After cooling, each sheet is peeled off and cut into wide noodle-like strips. The result is silky, slightly chewy, and almost bouncy in texture.
A rice-based version also exists, rooted in the dish’s origin story. For this style, rice is soaked overnight, ground into a slurry, filtered, and steamed in the same way. The rice version tends to be smoother and more tender, while the wheat version has a bit more chew.
The Gluten That Comes With It
One of the best parts of wheat-based liang pi is that the washing process creates a bonus ingredient. That ball of gluten left behind after the starch is removed gets steamed or baked into a spongy, honeycombed block called mian jin. After cooking for about 30 minutes, it puffs up and develops a springy, airy texture. It’s then cut into cubes and tossed right into the bowl alongside the noodles.
These gluten cubes act like little sponges, soaking up the sauce and adding a satisfying chewiness that contrasts with the slippery noodles. It’s a clever zero-waste approach: both components of the wheat end up in the same dish.
The Sauce and Seasonings
Liang pi noodles are mild on their own, so the sauce does the heavy lifting. Three ingredients are considered non-negotiable: Chinese chili oil, black rice vinegar, and minced raw garlic. The interplay of heat, acidity, and pungency is the backbone of the dish.
The chili oil is often homemade and infused with whole spices like star anise, bay leaves, Sichuan peppercorn, and cassia cinnamon. Some regional versions go further with a “spiced water,” made by simmering those same aromatics in water with a touch of starch to thicken it slightly, then mixing in vinegar and garlic after it cools. Light soy sauce and sesame oil round out the dressing. The finished sauce hits almost every flavor at once: salty, sour, spicy, nutty, and aromatic.
How It’s Served
A bowl of liang pi is assembled rather than cooked. The cold noodle strips go in first, followed by cubes of steamed gluten, then a handful of fresh or lightly prepared vegetables. Shredded cucumber is the most common addition, along with mung bean sprouts, shredded red cabbage, and sometimes fresh cilantro or crushed peanuts. Everything is tossed together with the sauce just before eating.
The dish is served cold or at room temperature, which is why it’s so closely tied to summer in China. Street vendors and small shops selling liang pi are treated as a seasonal signal that warm weather has arrived. A standard serving runs about 160 calories for six ounces, with roughly 29 grams of carbohydrates, 6 grams of protein, and under 3 grams of fat, making it a relatively light meal.
Liang Pi vs. Liang Fen
Liang pi is sometimes confused with liang fen (凉粉), a related but distinct cold dish. Liang fen is made from pure mung bean starch (or pea starch) mixed with water at a ratio of about 1 part starch to 7 parts water, heated until thick, then chilled until it sets into a firm jelly. The jelly is cut into noodle-like strips and dressed with a similar spicy, vinegary sauce.
The texture is noticeably different. Liang fen is more gelatinous, slippery, and jiggly, while liang pi has a chewier, more noodle-like bite. Liang fen also skips the gluten component entirely since there’s no wheat involved. Both are popular summer street foods across western China, including Sichuan, Yunnan, Gansu, and Shaanxi provinces.
Origins in Shaanxi
Local legend traces liang pi back to the Qin Dynasty, over 2,000 years ago. The story goes that during a severe drought in Shaanxi, farmers couldn’t deliver their usual tribute of fresh rice to the imperial court. A local leader suggested using leftover rice from the previous year, soaking it overnight, grinding it into a slurry, and steaming the filtered liquid into thin sheets. The cooled rice skins were dressed with chili, vinegar, sesame, salt, and soy sauce and sent to Emperor Qin Shi Huang, who reportedly found them so delicious that he made liang pi an annual royal tribute.
Whether or not the legend is historically accurate, liang pi has been a defining street food of Xi’an and Shaanxi Province for centuries. It has since spread across all of China, and in recent years, it’s gained a following internationally through Xi’an-style restaurants and home cooks sharing the washing technique online.