Mung Bean Noodles (Sotanghon)

Mung bean noodles, called cellophane noodles, glass noodles, bean thread noodles, or sotanghon in the Philippines, are translucent strands made from mung bean starch (Phaseolus aureus). When dried they are brittle and almost invisible against a white surface; hydrated, they become slippery, springy, and gelatinous with a clear, glassy appearance. Their mild, faintly bean-like flavor is nearly neutral, which makes them exceptional absorbers of surrounding seasonings — a characteristic that defines their role in kitchens across East and Southeast Asia.

The noodles owe their unique texture to the starch extracted from soaked, ground, and washed mung beans, a process that separates the protein from the starch. Some commercial brands add potato starch or canna starch to modify elasticity or cost. The result is a noodle with far more chew than rice vermicelli and far less than wheat pasta — it holds its shape in liquid dishes without breaking down, yet firms pleasantly when cooled. This behavior makes the distinction from rice vermicelli critical: rice vermicelli softens and fragments more easily, better suited to fresh spring rolls, while mung bean glass noodles maintain integrity in soups and saucy stir-fries.

In Filipino cooking, sotanghon refers specifically to the noodle used in sotanghon soup (sotanghon manok), a clear broth with chicken, vegetables, and sometimes quail eggs or pork. Filipino commercial brands sometimes include a small amount of wheat noodle or food coloring, unlike purer East Asian versions — always check the label if avoiding gluten. The noodle's ability to turn transparent and slip through the broth while absorbing flavor makes it both a textural counterpoint and a flavor vehicle in this and countless other dishes across Korean, Thai, Vietnamese, and Chinese cuisines.