Combine pepper, salt, paprika, cayenne, onion powder, garlic, sugar, mustard, and olive oil. This should make a thick paste.

Spread mixture over salmon and let sit for an hour or so

Chop onion. Heat olive oil in a pan and add onion. Cook until golden & caramelized. Set aside.

Preheat oven to 400. Bake salmon for approx 20 mins. I sometimes add a little maple syrup to the bottom of the pan before baking. Make sure to put down non stick foil if you do this for easier cleanup

Spread caramelized onions generously over the top of the salmon. Serve.