1 In a heavy-bottomed saucepan, add the minced shallots, pepper, vinegar, one teaspoon of chervil and one of tarragon and let reduce until you have about one tablespoon left.
2 Meanwhile, melt your butter, remove it from the heat and a few moments later, remove the solids, the casein, that float on the surface.
3 Place the bottom of your saucepan containing your reduction in cold water then add your egg yolks and whisk everything together well.
4 Now set your saucepan in a bain-marie over the heat and whisk constantly until you reach the consistency of mayonnaise. Then mount your béarnaise sauce with your melted butter, stopping before you reach the milk solids at the bottom.
5 Remove from the bain-marie, season with salt and pepper then add the last two teaspoons of tarragon and chervil.
Some of my colleagues strain the sauce through a fine sieve before adding the fresh herbs.
Béarnaise sauce, which I personally consider one of the greatest sauces of French gastronomy, pairs beautifully with fish and meat.
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