This is a quick way to make a nice piece of fish.
Spread pesto sauce on salmon and add slices of tomato and onion. Sprinkle some salt and pepper and you are good to go!
You can either grill this or broil it, I normally grill it. Depending on the thickness of the fillet will dictate the cooking time. Wrap in tinfoil and cook until fork cuts through it easily and the fish is flaky.