Japchae is a Korean dish that consists of stir-fried glass noodles with vegetables and sometimes meat. The noodles are made from sweet potato starch and have a chewy texture. Japchae is often seasoned with soy sauce, sesame oil, and other seasonings. It is a flavorful and colorful dish that is often enjoyed as a side dish or a main course. Japchae is a popular dish in Seoul and is loved for its combination of textures and flavors.