Ingredients:

Cut beef — 600 g
Butter — 50 g
Onions — 50 g
Vegetable oil — 25 g
Parsley — to taste
Ground black pepper — to taste
Salt — to taste

Preparation:

1. Meat lightly beat off, to rub salt and pepper, sprinkle with oil and leave for half an hour on a platter. Put in a pan or in a roasting pan with very hot butter and fry on both sides until a crispy crust, but inside the steak to remain slightly moist.
2. Butter mix with onion, parsley and a pinch of pepper. Smear the resulting green oil on the bottom of a deep dish, put a steak in it, cover the dish and put the dish on the water bath for 5-7 minutes.
3. Pour meat juice from the pan and serve with mashed potatoes.