Boiled dressing
Instructions:
- Sift the flour, mustard, sugar, salt, and white pepper into a small, heavy saucepan. Whisking constantly, add the cold water in a slow, steady stream, whisking until smooth. Whisk in the yolks and vinegar.
- Cook over medium-low heat, stirring constantly with a heat-proof spatula, until the sauce is thick enough to coat the spatula, about 3 minutes. The sauce can thicken abruptly, so watch it carefully and stir well around the edge of the pan.
- Remove the pan from the heat and whisk in the butter until it melts. Whisk in the cream.
- Transfer the sauce into a small glass bowl or jar, let cool to room temperature, then cover and refrigerate until chilled. Store covered and refrigerated for up to 1 week.