01 -
Cook Japanese short-grain rice according to package directions and keep warm.
02 -
In a skillet over medium heat, combine soy sauce, mirin, sake, sugar, and dashi. Add sliced onion and simmer for 3 to 4 minutes until slightly softened.
03 -
Add thinly sliced beef to the simmering sauce and cook gently for 2 to 3 minutes until just barely cooked through. Avoid overcooking.
04 -
For a soft-boiled egg, cook in boiling water for exactly 6 minutes, then immerse in ice water before peeling. For a poached egg, crack into gently simmering water with a splash of vinegar and poach for 2 to 3 minutes.
05 -
Spoon warm rice into a serving bowl. Arrange cooked beef and onions neatly over the rice. Place the soft-boiled or poached egg in the center. Drizzle reserved sauce over the beef and rice.
06 -
Garnish with chopped green onions or chives. Optionally, sprinkle sesame seeds on top. Serve promptly.