Béarnaise Sauce
Hollandaise's more interesting sibling — built the same way (egg yolks emulsified with butter) but flavored with a tarragon-shallot-vinegar reduction. Béarnaise is the traditional partner for steak, and once you have made it from scratch, you will understand why. Bottled versions do not come close.
Instructions
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Make the reduction: Combine vinegar, white wine, shallot, 1 tablespoon tarragon, and cracked peppercorns in a small saucepan. Simmer until reduced to about 1 tablespoon of liquid. Strain through a fine-mesh sieve, pressing on the solids. Let the liquid cool slightly.
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Whisk egg yolks and the strained reduction in a heatproof bowl until combined.
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Set the bowl over a pot of barely simmering water. Whisk continuously while adding the melted butter in a very thin stream — exactly as you would for hollandaise.
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Continue whisking until the sauce is thick and creamy, about 4 minutes. If it gets too thick, add a few drops of warm water.
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Remove from heat. Stir in the remaining 2 tablespoons of fresh tarragon and season with salt.
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Serve immediately with grilled steak, roasted vegetables, or poached fish.