Slice the beef very thin. I like skirt steak, but any will do. I put the beef in the freezer for a bit so I can slice it thin. Cut it cross grain.

Bring the beef broth, soy sauce, mirin and sugar to a boil.

Reduce the heat to medium and add the onions. Cook the onions until they are tender.

Add the beef and cook until just barely done.

Serve over rice and garnish with green onions.