In a large pot, bring water to a boil. Add lemon slices, minced garlic, bay leaf, and salt.
½ lemon, 2 cloves garlic, 1 bay leaf, ½ tablespoon salt
Once boiling, add the shrimp and cook until pink and fully cooked, about 2–3 minutes. Avoid overcooking.
1 pound large shrimp
Drain the shrimp and immediately transfer them to a bowl of ice water to stop the cooking and keep them firm.
In a small bowl, mix ketchup, prepared horseradish, lemon juice, Worcestershire sauce, and hot sauce. Season with salt and pepper to taste.
¼ cup ketchup, 2 tablespoons prepared horseradish, 2 tablespoons lemon juice, ½ tablespoon Worcestershire sauce, ¼ teaspoon hot sauce, Salt and pepper
Arrange the chilled shrimp on a serving platter. Serve with the cocktail sauce, lemon wedges, and fresh parsley.
1 lemon, Fresh parsley