Koshitantan is an izakaya in Udagawacho, Shibuya, Tokyo, that serves chicken nanban and grilled chicken. The chicken nanban is topped with tartar sauce and served with cabbage salad and miso soup. The shop has four tables and seats about 15 to 20 people, and customers can choose their own chopstick rests. Even on weekdays, the wait can run 10 to 20 minutes.