Prepare the Shrimp: Fill a large pot with water and bring it to a boil. Add salt, a splash of lemon juice, and a few lemon wedges to infuse flavor into the shrimp. Carefully add the shrimp and cook for 2-3 minutes or until they turn pink and opaque. Avoid overcooking, as this can make the shrimp rubbery. Remove and transfer the shrimp to a bowl of ice water to chill quickly.

Make the Cocktail Sauce: In a mixing bowl, combine ketchup, horseradish, Worcestershire sauce, and fresh lemon juice. Mix well until all the ingredients are fully incorporated. Taste and adjust the horseradish or lemon juice to suit your preference. For extra heat, add a few drops of hot sauce. Refrigerate until ready to serve.

Assemble and Serve: Arrange the chilled shrimp on a platter or in a serving glass. Serve with a small bowl of cocktail sauce in the center. Garnish with parsley sprigs and lemon wedges for an elegant touch. If using a platter with ice, ensure the shrimp remain cold for the best texture and flavor.