Ingredients
1 large egg, plus 2 large egg yolks
1/2 cup creme fraiche
1 cup whole milk
6 tablespoons white wine vinegar
1 tablespoon all-purpose flour
1/2 teaspoon ground mustard
1 teaspoon coarse salt
1/2 teaspoon freshly ground white pepper
Preparation
Prepare an ice-water bath; set aside. Put all ingredients into a blender, and blend until well combined.
Transfer mixture to a heatproof bowl set over a pan of simmering water. Whisk until mixture coats the back of a wooden spoon, 4 to 5 minutes. Continue to cook, whisking, 3 minutes.
Pour mixture into a bowl set in the ice-water bath. Let stand, stirring occasionally, until completely cool.
