For the vinaigrette, combine all wet ingredients in a mixing bowl and mix well until emulsified then fold through chives, eschalot, tarragon and chervil and salt to taste.
For the salmon, season well and cook skin side down until crispy then finish 1 minute on the other side on low heat.
Grill asparagus with olive oil until nice colour and season with salt.
Plating, spoon herby ketchup vinaigrette over fillets and finish with lemon juice and parsley.