Line a baking tray with foil and set aside.
In a medium bowl, combine olive oil, lemon juice, lemon zest, garlic, mustard and salt.
1½ tbsps olive oil, 1 tablespoon fresh lemon juice, zest of a lemon, 2 garlic cloves, 1 teaspoon Dijon mustard, ½ teaspoon cooking salt
Add salmon fillets to the bowl with the lemon mixture and turn to coat.
4 salmon fillets
Pre-heat your grill or broiler to 280c (or as high as it goes) and place the shelf 20cm away from the heat source/element (see my notes).
Place salmon onto the lined tray, leaving a little space between each fillet.
Place the baking tray under the grill and cook for 11 minutes, or until the salmon is cooked and the flesh flakes apart when tested with a fork.
Sprinkle with finely chopped parsley and grated parmesan (if using) and serve with extra lemon slices.
finely chopped parsley, grated fresh parmesan, lemon slices