Preheat the oven to 180C.
Line a large baking tray with baking paper or foil.
Place the salmon on the tray, skin side down.
Drizzle the oil over the top and season with salt and pepper.
Roast in the oven for 25 to 30 minutes (depending on thickness), or until the core temperature reaches 55C.
Meanwhile, put the dressing ingredients in a blender and blitz until combined, then season to taste with salt and pepper.
Combine the pistachio and dill in a small bowl.
Once cooked, remove the fish from the oven and allow to rest for 5 minutes.
To serve, pour the dressing over the fish, then scatter the pistachio and dill mixture on top.
