Wash and peel the asparagus and cut off the woody ends. Melt the clarified butter. Wash the meat, dab dry. Heat oil in a roasting pan. Fry the meat for 4-5 minutes, turning it over, and take it out. Cut mozzarella into slices. Wash and clean the tomatoes, dab dry and cut into slices. Cut pieces of meat 3-4 times to half. Put 1 slice of mozzarella and 1 slice of tomato into each of the cuts. Season meat with salt and pepper, place on a baking tray. Wash parsley, shake dry. Pluck the leaves from the stalks and chop them, except for something to garnish
Cook the meat in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see manufacturer) for approx. 12 minutes in medium heat. Cook the asparagus in plenty of boiling salted water with 2 teaspoons of sugar for 12-15 minutes. Whisk the egg yolks and white wine, season with a little salt and sugar, whip until frothy over a hot water bath. Gradually fold in the liquid clarified butter. Season sauce with sugar, salt and lemon juice, keep warm
Remove the meat, cover with foil and let it rest for about 5 minutes. Take out asparagus and let it drip off. Arrange on plates with sauce and meat. Sprinkle with parsley and garnish. Serve with parsley potatoes