Rinse the salmon fillets, and pat them thoroughly dry.
Stroke your hand hand along the salmon fillet to check for any stray bones. Use tweezers or pliers to pull out any pin bones, if necessary.
Grate the lemon, oranges and lime, creating zest.
Put third of the mixture on a baking pan that is big enough to lay a fillet flat on.
Lay the fillet skin-down on the mixture.
Spread the rest of the mixture on the flesh side of the fillet.
Cover the fillets and baking sheet with foil or plastic wrap.
Let the salmon chill about 2 days (no longer than 6 days).
Remove from fridge, unwrap and rinse under cold water.
Cut into thin slices without getting too close to the skin, so the dark salmon is included.