For the vinagrette
For the steak
First, prepare the vinaigrette. Chop the shallots and place them in a small bowl. Add soy sauce, olive oil and wasabi and combine well.
Cut the leftover steak into very thin slices and place them on four plates.
Cut the cucumber and the scallions into thin slices. Arrange the cucumber slices atop the steak slices. Spread the scallions on top and season with some salt.
Now sprinkle with the vinaigrette and serve.