Boil the peeled prawns in salted water until tender and chill immediately.
Chop cilantro and green onions. Peel chili or jalapenos from seeds (work with gloves!) And chop finely. Cut the avocado and tomatoes into 1 x 1 cm cubes.
Juice 2 limes and mix with ketchup and grated horseradish. This is a kind of homemade seafood cocktail sauce, if you have a ready-made sauce just add lime juice and add a teaspoon of Worcester sauce to taste.
In a large cup, pour the ketchup + horseradish and lime sauce over the herbs, tomatoes, avocado and chilled shrimp, and salt. We leave the appetizer in the refrigerator for 10 minutes. Serve this snack with corn chips and lime slices.