Mix the dashi base, water, and sugar, then marinate the beef in a bowl for half an hour with the dashi base.
Start cooking the rice after the 1/2 hour, according to the rice you pick.
Heat the oil, then cook the beef until browned on each side before setting aside.
Cook the onions for 2 mins on medium heat. Add flour and cook for another 2 mins. Add Dashi liquid, then simmer until the sauce thickens, about 10-20 mins. Heat the meat in the sauce for a few minutes.
In a bowl of your cooked rice, move the beef onto the rice, then decorate with onions, carrots, cabbage, and chives. Then pour some sauce on the rice.