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What makes this sauce illegitimate? I have heard the name comes from the fact that the sauce does not derive from a “mother” sauce, and thus it is illegitimate. Maybe, maybe not…
Melt 15 grams butter in a small saucepan over medium heat. Add the flour and stir to incorporate. Cook the flour for a while, but do not let it brown.
2
Whisk in the hot water and bring to a boil. Then remove the saucepan from the heat and continue whisking until the sauce is smooth. Add the egg yolk, cream, and lemon juice and mix well while gently reheating.
3
Pass the mixture through a fine strainer. Season the sauce with salt and grind in a little pepper. Beat in the remaining butter.