Yoshinoya is a Japanese fast-food chain in Mong Kok, Hong Kong, serving gyudon as its main dish along with curry and udon. Its signature item is seasoned beef gyudon, and it also sells teriyaki chicken, udon, and shabu-shabu. Orders are placed at electronic kiosks at the entrance and paid for with an Octopus card, and food arrives almost immediately. At lunchtime there are not enough seats, so the wait is long.