Prepare the beef: Trim the beef of all fat and sinew, ensuring only the leanest portion is used. Finely chop the meat by hand using a sharp knife, avoiding a food processor to maintain the texture. Place the chopped beef in a chilled bowl to keep it fresh while you prepare the other ingredients.

Mix the seasonings: In a small bowl, combine the minced shallots, chopped capers, Dijon mustard, Worcestershire sauce, and parsley. Mix well to create a flavorful seasoning blend. Adjust the quantities to taste, keeping in mind that a balance of tangy, salty, and fresh flavors is key.

Assemble the tartare: Add the seasoning mixture to the chopped beef, along with a drizzle of olive oil. Gently fold the ingredients together using a fork, ensuring everything is evenly distributed. Be careful not to overmix, as this could compromise the texture of the tartare.

Plate the dish: Transfer the tartare to a serving plate, shaping it into a neat mound or using a ring mold for a professional presentation. Top with a whole egg yolk in the center or mix the yolk into the beef for a creamier texture.

Serve immediately: Pair the tartare with toasted baguette slices, crackers, or a side salad. To maintain freshness and food safety, serve the dish promptly and keep it chilled if not eaten right away.