Creating a delicious Mexican Shrimp Cocktail is straightforward if you follow these steps:

1. Cook the Shrimp: Bring a pot of salted water to a boil. Add the shrimp and cook for 2-3 minutes, or until they are pink and opaque. Drain and transfer them to an ice bath to stop the cooking process.
2. Prepare the Vegetables: While the shrimp cool, dice the tomatoes, avocado, and red onion. Finely chop the cilantro and mince the jalapeño.
3. Mix the Cocktail Sauce: In a mixing bowl, combine the ketchup, lime juice, and optional hot sauce. Stir until well blended.
4. Combine Ingredients: In a larger bowl, add the cooked shrimp, diced tomatoes, avocado, red onion, cilantro, and jalapeño. Pour the cocktail sauce over the mixture.
5. Season: Add salt and pepper to taste. Gently toss everything together until well coated.
6. Chill: Cover the bowl with plastic wrap and refrigerate for at least 60 minutes, allowing the flavors to meld.
7. Serve: When ready to eat, give the cocktail a gentle stir and serve it in individual cups or bowls with tortilla chips or tostadas.