Grate the zest of one lime and leave it for squeezing, lightly oil a non-stick baking tray, lay the salmon fillet on it, squeeze over juice of 1/2 lime, brush the salmon with a little olive oil, season with salt and pepper to taste, add some basil leaves and roast for 18 min (for a fillet) or 15 min (for a steak) in a preheated to 170 degrees Celsius oven.
For the salsa: chop the onion, cut the pineapple (approx. 1x1 cm), squeeze the juice of 1/2 lime, add the lime zest, chop the basil leaves, season with some salt and pepper to taste, add 1-3 tbsp of olive oil and finely mix