Soak the rice cakes in hot water for 10 minutes. Drain and set aside.

In a bowl, mix the sauce ingredients

In a wok over high heat, heat a little oil and stir-fry the steak for 5 minutes. Set aside.

Stir-fry the green onions for 5 minutes. Set aside.

Lower the heat to medium, pour in the sauce and reduce while stirring. Don't hesitate to add more oil and lower the heat if it starts to stick/burn.

Once it has reduced well, add the tteok, meat, and green onions. Mix and continue to reduce if necessary.