Japchae (pronounced 'chop chay') is a traditional Korean glass noodle dish made with sweet potato starch noodles, stir fried colorful vegetables, protein, and toss together with a sweet and savory soy based sauce. The literal translation of japchae means mixed vegetables. But overtime, Koreans started adding sweet potato starch noodles to this dish. It's served during special occasions and holidays but can also be enjoyed as a regular side dish or entree. It's popular because of its versatility and ability to make ahead.