Shrimp Cocktail with Horseradish Cocktail Sauce

Ingredients:
4 lbs. jumbo shrimp (peeled and de-veined)
1 cup ketchup
2 Tbs. fresh or store-bought horseradish
1 tsp. Worcestershire sauce
1/4 cup of lemon juice
1 tsp. dried onion powder
1 fresh lemon for garnish
1 bunch fresh Italian parsley
Preparation:
Drop shrimp into boiling water and reduce heat to simmer. Remove the shrimp from the water before they curl up (it will take about 3-4 minutes).
For cocktail sauce, combine ketchup, Worcestershire sauce, horseradish and lemon juice in a bowl and refrigerate for at least 15 minutes before serving. You can also add dried onion powder if you desire. Salt to taste.