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Tip: If you can't find fresh tarragon, you can use dried tarragon instead.
Peel and finely chop the shallot. Chop the pickles as finely as possible and also finely chop the capers. Finely chop the fresh chives, parsley and tarragon.
Combine the shallot together with the pickles, capers, chives, parsley and tarragon. Finish the sauce by stirring in mayonnaise, crème fraîche and mustard.
Season the sauce with salt and pepper, traditionally this sauce is served with kibbeling, a Dutch fried snack. Enjoy!