Jiro Ramen in Hongdae is a Japanese ramen restaurant that mainly serves tonkotsu ramen and tantanmen. Its signature Jiro Ramen pairs a rich, salty tonkotsu broth with thin hosomen noodles, and customers can choose the noodle doneness and the broth concentration. The shop has only counter seats, and it draws a wait even on weekdays. The broth is salty and thick, on the strong side.