https://www.allrecipes.com/recipe/237475/chef-johns-shrimp-cocktail In large pot combine 6 cups water, salt, sugar, onion, and 5 sprigs parsley. Fill a large bowl halfway with ice and add water to cover; set aside. Cut one lemon into wedges and set aside. Remove with a slotted spoon to a bowl of cool water. https://www.thegraciouswife.com/homemade-shrimp-cocktail-sauce-recipe Add the shrimp and cook, uncovered, for only 3 minutes, until the shrimp are just cooked through.