Clean and roughly chop the vegetables.
Blend all the vegetables in a mixer with some oil, salt and pepper, and then pass through a strainer.

Season the beef with oil, salt and pepper, thoroughly massaging the meat.
Briefly sear the beef on all sides in a pan without any fat and then cut into slices.
Plate the meat and then cover the rest of the surface of the plate with the sauce.
Garnish with chives.