How to Make It
In a medium saucepan of boiling salted water, cook the shrimp for 1 minute, or until they are opaque throughout. Drain the shrimp and spread them on a baking sheet. Let the shrimp cool in the refrigerator, about 10 minutes.
Meanwhile, in a medium bowl, mix the ketchup with the cilantro and horseradish. Fold in the cooled shrimp and the avocado and season with salt and pepper. Transfer the shrimp cocktail to bowls and serve right away.
Tortilla chips and fresh lime wedges.