Submerge the sardine fillets in vinegar and let it rest in the refrigerator for approximately 2 hours.
Remove the fillets from the vinegar and place them on a tray.
Distribute the tomato and onion cubes, along with the grains of pink pepper on top of the sardine fillets. Save in the fridge until you serve it.
Before serving add the EVOO and season.
4 servings