01 -
Fill a large saucepan three-quarters full with water. Add 0.5 teaspoon salt. If using lemon, squeeze juice into the water and add both peel and flesh. Add peppercorns and parsley, if desired.
02 -
Bring the mixture to a rapid boil over high heat, then remove from heat to let boiling subside.
03 -
Add the shrimp to the hot liquid. Stir, cover the pan, and let shrimp steep for 4 to 5 minutes, until opaque and pink.
04 -
Meanwhile, combine two cups of ice cubes and cold water in a large bowl to create an ice bath.
05 -
Drain the shrimp, reserving only the shrimp. Transfer shrimp immediately to the ice bath to halt cooking. Let them cool for several minutes, then drain well.
06 -
Remove shells from shrimp but leave tails attached for easy serving.
07 -
In a medium bowl, combine ketchup, horseradish, pinch of salt, and if desired, lemon juice, Worcestershire sauce, and hot sauce. Mix well and adjust horseradish to taste.
08 -
Divide cocktail sauce between four individual bowls or glasses. Hang shrimp on the rims and serve immediately.