1 Mix all the marinade ingredients, put the steak in the marinade and marinate for at least 1 hour.
2 Wash and sort the rocket and soya bean sprouts and drain well.
3 Toast the peanuts in a small, dry pan.
4 Put all the vinaigrette ingredients into a beaker and mix with a hand blender. Add a little water if necessary.
5 Remove the steak from the marinade and drain the excess. Heat the clarified butter and quickly sear the steak on all sides over a fairly high heat. Then wrap in aluminium foil and put into the oven at 80°C | 175F for 20 minutes.
6 Slice the meat very thinly. Put the rocket and bean sprouts into bowls, add the meat, nuts, spring onions and peppers and serve. Serve the vinaigrette separately at table.