An easy soybean sprout japchae. a Korean dish made with sweet potato starch noodles called dangmyeon (당면). The traditional dish includes thin strips of beef and various vegetables, but there are many variations! Depending on the main ingredient accompanying the noodles, the variations are called buchu (garlic chives) japchae, beoseot (mushroom) japchae, gochu (chili peppers) japchae, ueong (burdock root) japchae, kongnamul (soybean sprouts) japchae, etc.