Preheat oven to 425°F. Line a sheet pan with parchment paper.
Stir together salsa ingredients in a medium bowl. Cover and set aside at room temperature until ready to serve. If making more than 6 hours ahead store in fridge, but let sit at room temperature for 1 hour before serving.
Lightly brush each salmon fillet with olive oil and season with a pinch of salt and pepper. Bake for 10 to 15 minutes, depending on thickness (see note below). Flesh should be slightly rare in the centre and bounce back when finger touches the top of the fillet. Allow to rest 5 minutes before serving.
Serve each fillet of salmon with a heaping spoonful of salsa on top.