Preheat the oven to 200C/400F/Gas 6.
In a small bowl, mix the spices together, then sprinkle onto a plate.
Press the salmon into the spices to coat well.
Heat one tablespoon of olive oil in a small ovenproof frying pan and fry the salmon on both sides until golden-brown.
Transfer the ovenproof frying pan to the oven and cook for a further 4-5 minutes, or until cooked through.
In a small bowl, whisk together the remaining olive oil, white wine vinegar and Dijon mustard until thick and creamy.
Add the chopped herbs, onion and courgette to the mustard mixture and mix well.
To serve, place the salmon in the centre of a serving plate and spoon the herb salsa around the edge.