From Cook's Illustrated, here are their notes: This relish accentuates the mild flavor of the sea inherent in salmon. The brininess of the olives and capers amplifies the salty, ocean-like taste; the garlic and lemon contribute a pungent acidity that cuts through the salmon’s richness; and the freshness of basil lightens and lifts the whole dish.
Ingredients
1 cup pitted kalamata olives, chopped fine
1 tablespoon capers, rinsed and minced, plus 1 teaspoon brine
1 tablespoon minced fresh basil
1 tablespoon lemon juice
1 tablespoon extra-virgin olive oil
1 garlic clove, minced
Instructions
Combine all ingredients in bowl and season with salt and pepper.
(Note: this recipe was link from their Pan Seared Salmon recipe)