Rinse the fish in water and cut into slices, starting from the tail. It is advisable to chop slightly thawed mackerel so that it does not fall apart. Cut together with the entrails, then rinse each piece of fish in water and remove the black film from it along the peri of the abdomen. Place in a deep container.
Squeeze the juice of half a lemon and lime, season with salt and pepper. Press lightly on the fish slices to absorb as much of the juice as possible. Leave on for 15-20 minutes, turn over from time to time.
When denaturation begins, you will see how a light foam forms on the surface of the cut – these are flakes of protein.
After the indicated time, place the mackerel ceviche on a plate, garnish to your liking and serve. The dish is perfect with a glass of white wine or light beer!