Mix all the marinade ingredients, put the steak in the marinade and marinate for at least 1 hour.
Wash and sort the rocket and soya bean sprouts and drain well.
Toast the peanuts in a small, dry pan.
Put all the vinaigrette ingredients into a beaker and mix with a hand blender. Add a little water if necessary.
Take the steak out of the marinade and drain. Heat the clarified butter and quickly brown the steak on all sides over a fairly high heat.
Then wrap in aluminium foil and put into the oven at 80°C for 20 minutes.
Slice the meat very thinly. Put the rocket and bean sprouts into bowls, add the meat, nuts, scallions and peppers and serve.
Hand the vinaigrette separately at table.