A type of DonBuri food involving thinly sliced beef and onions cooked in a sauce primarily consisting of Sake, Mirin, SoySauce, and Sugar. An extremely popular food served at FastFood ChainRestaurants such as YoshiNoya, MatsuyaResto, and SukiyaResto.
Figure 1: An advertisement for Gyudon at a local ChainRestaurant.