Coat the chopped white fish or shrimp with fresh lime juice in a large bowl.

Let the fish or shrimp sit in the lime juice while preparing the vegetables.

Chop the tomatoes, cucumber, and onion.

Remove stems and seeds from peppers, then chop.

Mince the fresh cilantro.

Add the chopped vegetables, cilantro, and sea salt to the fish (which has been 'cooked' by the lime juice).

Mix all ingredients to combine thoroughly.

Serve immediately or chill briefly before serving.