In a wide pan or pot, combine dashi stock, soy sauce, mirin, sake, and sugar. Bring the mixture to a simmer over medium heat.
Add the sliced onion to the simmering sauce. Cook until the onion is tender and translucent, about 5-7 minutes.
Gently add the thinly sliced beef to the pan, spreading it out evenly. Cook for 2-3 minutes, just until the beef is cooked through and no longer pink. Do not overcook.
Ladle a generous amount of beef and onion mixture over a bowl of freshly steamed rice. Garnish with pickled ginger or chopped green onions if desired.
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