Freeze meat in the freezer for 1 1/2-2 hours. Finely chop capers. Place wine, egg yolks, mustard powder, capers and pepper in a tall mixing bowl. Stir well with the whisk of the hand mixer
Stirring constantly, let the oil run in drop by drop until a creamy sauce is obtained. Put it in a cold place
Take meat out of the freezer and cut it into very thin slices with a slicing machine or a very sharp slim knife. If necessary, tap flat between cling film
Put meat on plates. Pour sauce in portions into a piping bag. Spray the sauce onto the meat in a diamond shape. Garnish with basil and sprinkle with pepper. Ciabatta tastes good with it
waiting time approx. 1 1/2 hours