Season the beef with salt and pepper, fry on all sides in a hot pan with olive oil and then roast for ca. 15 minutes in a preheated oven at 180 °C, turning over regularly.
Allow to stand for 5 minutes.
Mix the onions, tomato, parsley, Worcester sauce, vinegar, olive oil, tomato juice, sugar, salt and pepper and season as necessary.
Squeeze out the gelatin leaves, dissolve in 2 tablespoons of hot water, add to the mass and mix well.