Preheat the oven to 180C/350F/Gas 4 (fan 160C).
Arrange the salmon fillets with a little space between each one, on a buttered roasting tin and sprinkle with black pepper. Cover tightly with aluminium foil and bake for 15 minutes, or until the fish turns an opaque pink colour (no longer shiny pink). Remove the foil and allow to cool, then cover and leave to chill in the refrigerator.
Bring a frying pan with water to the boil, add the asparagus and boil for just three minutes or until tender when pierced with the tip of a knife. Plunge into ice cold water to stop them cooking any further, then drain well.
Bring a small pan of water to the boil and cook the quails' eggs for just two minutes. Plunge into ice cold water to stop them cooking any further, then drain well and peel off the shells.
For the sauce, place all the sauce ingredients in a blender or food processor and blend until smooth. Taste and season with salt and pepper, if necessary.
Spoon a little of the herb sauce on top of each piece of salmon, top with half a quails' egg and two asparagus spears. Serve the remaining sauce in a sauce boat and arrange the remaining quailâ€™s eggs on the serving platter.