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First, make the dressing. Mix the vinegar, shallot, sugar, salt and pepper in a bowl, then whisk in the olive oil. Tear the salad leaves into bite-size pieces and set aside. Now, heat a griddle pan to high.
Brush the steaks lightly on each side with oil, then season with salt and pepper. Griddle for 2-3 mins on each side, until cooked to your liking. Toss the salad in the dressing. Top each steak with a few slices of Horseradish & chive butter, then serve with the salad.