Steak Tartare

Name: Steak Tartare
Ingredients: 2 egg yolks; 2–3 tbsp. ketchup; 2 tsp. dijon mustard; 1 tsp. worcestershire sauce; 2–3 dashes Tabasco; 3 tbsp. olive oil; 3–4 tbsp. fresh lemon juice; Salt and freshly ground black pepper; 1 lb. rump steak, exterior fat removed; ½ small yellow onion, peeled and chopped; 3 small cornichons, chopped; 2 tsp. capers, drained; ¼ bunch parsley, trimmed and chopped