Ingredients (serves 4):
In a bowl, marinate beef with wine or sake, sugar, mirin, salt, soy sauce and grated ginger.
Place onion and dashi in a sauce pan. Cook for 5 minutes at medium heat.
Add marinated beef to the sauce pan, cover with lid and continue to cook for 5 more minutes or until beef is cooked through.
Fill each serving bowl with cooked rice and top with cooked beef and onion.
Serve while hot with optional pickled red ginger.