Cellophane noodles (also called bean threads) are fine, translucent threads made from the starch of green mung bean and tapioca starch. When soaked they become shiny and slippery and are enjoyed because they absorb the flavors of other foods. Cellophane noodles are traditional throughout Asia, and are used extensively in salads and soups in Japan as well as throughout all regions of China. This cold dish is considered an appetizer or side-dish to a meal.