Chop the shrimps in half and place in a bowl.

Marinate the shrimps by pouring the lime juice in the bowl until they are completely covered and are floating freely.

Cover the bowl and place in the fridge for 4 hours.Mix the cilantro, jalapeno,chopped tomato, and scallions in a separate large bowl.

Add salt and pepper to taste.

Completely drain the shrimps using a colander and add to the large bowl.

Gently toss until all the ingredients combine.

Add the chopped avocado and squeeze some lime over the mixture.

Prepare lettuce leaves on a plate and transfer one or two tablespoons of ceviche into the leaves.

Serve.

As an alternative, serve the ceviche in a dish with the lettuce leaves all around so that the guests can serve themselves.