Boil water in a large pot and cook the shrimp until pink, about 2-3 minutes.
Drain the shrimp and place them in a bowl of ice water to stop the cooking process.
Chop the cooled shrimp into bite-sized pieces.
In a mixing bowl, combine tomato sauce, ketchup, and lime juice.
Add diced cucumber, tomatoes, cilantro, and red onion to the mixture.
Mix in the chopped jalapeño if desired.
Fold in the chopped shrimp gently until well combined.
Season with salt and pepper to taste.
Chill in the refrigerator for at least 30 minutes before serving.
Serve cold, garnished with lime wedges.