Preheat the oven to 200°C / 180°C fan or Gas Mark 6
In a bowl, mix the parsley, capers, lemon zest, garlic, and breadcrumbs together. You can also blend these ingredients together if you would prefer a finer crumb. Then season lightly.
Brush the skin of your salmon fillets with oil, then place them, skin down on a baking tray. Lightly season then put a fine layer of mustard on top followed by your gremolata mix.
Bake for 10-12 minutes or until the salmon is cooked to your liking. If you wish a crispier crumb on top then finish for a couple of minutes or so under the grill, keeping an eye on it so that it does not burn.
Serve the salmon fillets with your vegetables and a lemon wedge for seasoning before serving.