are also known as "glass noodles", "cellophane noodles", or "sweet potato vermicelli". The noodles may be soaked in water before cooking. Noodles are sometimes soaked in hot water and then stir-fried. The assortment of vegetables in japchae may vary, with typical ingredients including mushrooms, carrots, spinach, onions, egg and scallions. Commonly used mushrooms are wood ear, shiitake, and oyster mushrooms. Both beef and pork are commonly used for japchae. Each ingredient is stir-fried separately before being mixed with boiled and drained noodles, and seasoned with soy sauce, sugar, chopped garlic and sesame oil. The dish is usually garnished with toasted sesame seeds and chili threads, and served hot or cold. Varieties Royal court dishes Gyeoja-chae () Jokchae () – made with shredded jokpyeon (trotter jelly) and vegetables Tangpyeong-chae () – made with nokdu-muk (mung bean jelly), beef, mung bean sprouts, water dropwort, and mugwort Wolgwa-chae () – made with Oriental pickling melon, beef, and vegetables Juksoon-chae () - made with bamboo shoots and vegetables Other dishes Gochu-japchae () – made with shredded green pepper and vegetables Buchu-japchae () – made with garlic chives Kongnamul-japchae () – made with soybean sprouts Haemul-japchae () – made with seafood and vegetables Beoseot-japchae () – made with mushrooms Gungjung-japchae () - made with high-grade ingredients and royal vegetables See also Gochu-japchae Tangpyeong-chae Wolgwa-chae List of sweet potato dishes References Korean noodle dishes Mixed noodles