black fungus

Black fungus (木耳, mù ěr in Mandarin), also known as wood ear or cloud ear fungus, is a gelatinous fungus (Auricularia auricula-judae) that grows on decaying hardwood, particularly elder trees. Native to East Asia, it has been cultivated for centuries in China, Japan, and Korea. The fungus appears as dark, ear-like fruiting bodies ranging from deep purple-black to nearly black in color, with a fluted, wrinkled surface on the outer side and a smooth, pale underside. When fresh, it is tender and slightly springy; when dried, it becomes hard and brittle, but rapidly expands and becomes gelatinous when rehydrated in warm water, reaching several times its original size. The flavor is extremely delicate and neutral, allowing it to absorb surrounding flavors while contributing a distinctive slippery, crunchy texture to dishes.

Black fungus is a staple ingredient in East Asian cuisines, particularly Chinese, where it appears in stir-fries, soups, hot pots, cold salads, and wedding banquets. Its primary appeal lies in its unique texture—crisp when properly prepared—rather than flavor. It pairs well with ingredients like ginger, soy sauce, vinegar, sesame oil, and aromatic vegetables. Common preparations include rehydrating dried fungus and adding it to Sichuan hot pot, mixed vegetable stir-fries, or cold noodle dishes. The fungus is often combined with ingredients such as bamboo shoots, wood ear mushrooms' counterpart, or leafy greens. Outside East Asia, it is gaining presence in fusion cuisine and vegetarian cooking as a textural ingredient and source of dietary fiber.