0 If you do not have access to very fresh fish or shrimp or prefer to cook it prior to serving, bring a medium saucepan of water to a boil
1 As soon as the water comes to a boil, turn off the heat and carefully add the fish or shrimp into the hot water
2 Let the shrimp poach in the hot water for 3 minutes and then transfer them onto a cutting board using a slotted spoon
3 Cut the fresh or poached fish or shrimp into small chunks and place them into a large glass bowl
4 Add the remaining ingredients and a big pinch of sea salt and black pepper and mix until everything is evenly distributed
5 Cover the bowl tightly with plastic wrap and refrigerate for 30 minutes to 2 hours before serving
6 Serve chilled with tortillas, tostadas or lettuce cups
7 Enjoy within 4 hours of mixing
