Instructions: Place sugar and mustard in the top of a double boiler, and whisk to combine. When well combined, whisk in egg yolks and vinegar. Cook over simmering water, stirring occasionally, until thick enough to form ribbons when drizzled from a spoon, 10 to 15 minutes.

Remove from heat, and allow the mixture to cool. When cool, fold in the creme fraiche. Refrigerate in an airtight container until ready to use.

This recipe yields about 2 cups.

Yield: 2 cups

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