Old-Fashioned Boiled Dressing

Preparation

1. Prepare a hot bain-marie and an ice bain-marie.
2. Scald the half-and-half and hold hot.
3. Whisk together the yolks, cornstarch, salt, sugar, mustard, pepper, and vinegar. Whisk in the hot half-and-half.
4. Place the bowl over simmering water in the hot bain-marie and whisk until