1/4 tsp. Celery salt
2 tbsp. Hot sauce
1 tbsp. Worcestershire sauce
1 tbsp. Horseradish
2 tbsp. Fresh lemon juice
1 tsp. Lemon zest
1/2 cup Ketchup
1/2 cup Mild chili sauce
2 Lemons, divided
1 tbsp. Small bunch parsley, divided
1/2 Small onion, peeled and halved
2 tbsp. Granulated sugar
2 tbsp. Kosher salt
6 cups Water
2 pounds Ice
2 pounds Shrimp, peeled and deveined