Step 1

Make sure the shrimp has been adequately cleaned, deveined, and patted dry. Set aside in a large bowl.

Step 2

Add the lime juice, a pinch of salt, and the onion slices. Cover and put in the refrigerator for 20-30 minutes.

Step 3

Remove from the refrigerator and strain the lime juice from the shrimp and onions, and set aside.

Step 4

Add half of the lime juice that you strained in the previous step to a blender with the garlic, pepper, salt, serrano pepper, cilantro, a few pieces of the onion that marinated with the shrimp, and 2 tablespoons of the chopped cucumber. Blend well.

Step 5

Add the mixture made in the previous step to the bowl with the shrimp. Mix well and add additional lime juice and salt to taste.

Step 6

Add the remaining cucumbers and avocado slices (if desired) and serve cold with tortilla chips.