Genroku Udon is an udon restaurant near Hongdae and Hapjeong Station serving jidori udon, nikku udon, and zaru udon. Its broth draws sweetness from charred scallions and vegetables, and the noodles are thick and chewy like rice cake. Noodles can be added free in large, medium, or small portions, and you choose between regular, double, or triple servings. The strong peppery heat divides diners.