Put the egg yolk, lemon juice, and cayenne in a blender. Pulse a couple times to combine.
Put the butter in a small microwave-safe bowl and melt in a microwave until just melted. With the blender running, gradually add the melted butter into the egg to make a smooth frothy sauce. If the sauce is very thick, blend in a teaspoon of lukewarm water to loosen it up. Season with the salt and serve immediately or keep warm in a small heat-proof bowl set over hot (but not simmering) water until ready to serve.
Tools You May Need
Consumption of raw or undercooked eggs, shellfish and meat may increase the risk of foodborne illness.
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Tools You May Need
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