Sweet potato noodles, called japchae in Korea, are translucent and I usually find them in Asian grocery stores. This stir-fried noodle dish with various vegetables is generally served as a side dish, hot or cold. What makes these noodles unique is their slightly chewy texture and their ability to absorb flavors. It's a dish I make often because it's easy to adapt: it can be prepared with or without meat to suit all dietary needs.