Easy Homemade Gyudon Recipe

Make the Donburi sauce: In a big pot over a low-medium fire, combine dashi, mirin, soy sauce, and white sugar, and mix until sugar dissolves. 

Mix donburi sauce, onions, and mushrooms. Add beef and let simmer over medium heat until the sauce reduces.

To serve, put beef on top of a bowl of cooked rice and pour over the sauce as desired. Add 1 egg yolk in the center of the beef topping and garnish with spring onions. Repeat with remaining beef. Serve while hot.