Roastbeef Don

Rump steak marinated for 2 hours with soy sauce, sake, mirin, sugar, sesame oil, garlic and shishimi togarashi. Seared in butter on all sides then baked in the oven at 95°C for about 1 hour (until an internal temperature of 49°C). 10 minutes of rest and finely chopped. Cook the finely chopped onion for 5 minutes and add the remaining marinade. Add half to the rice and the rest to the meat slices.