"Béarnaise and steak are a match made in heaven, but this sauce has a few other divine uses. Try it spooned over poached eggs or spread over roast fish...."
INGREDIENTS
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1 tablespoon plus 1 cup (2 sticks) unsalted butter, cut into 1/2" cubes
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3 tablespoons minced shallots
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Kosher salt and freshly ground black pepper
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2 tablespoons Champagne vinegar or white wine vinegar
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2 large egg yolks
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1 tablespoon (or more) fresh lemon juice
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1 tablespoon finely chopped fresh tarragon