1 Vinegar diluted with cold water to make 1/2 cup (120 ml) total
Instructions
1. Combine the dry ingredients — mustard, salt, powdered sugar, and cayenne — in a heatproof bowl and stir to distribute evenly.
2. Add the slightly beaten eggs and the oil gradually, stirring constantly until the mixture is thoroughly combined. (This is an emulsification step: adding fat slowly while agitating prevents the dressing from breaking.)
3. Stir in the diluted vinegar.
4. Set the bowl over a saucepan of simmering water — the bowl should not touch the water — and cook, stirring constantly, until the mixture thickens to a consistency that coats the back of a spoon, 8–12 minutes, and registers 160°F (71°C) on an instant-read thermometer. This is the custard-thickening stage; the eggs are the thickening agent.
5. Immediately strain the dressing through a fine-mesh sieve into a clean bowl. Cool to room temperature, then refrigerate. The dressing will continue to thicken slightly as it chills.
6. Use within 3 days. The finished dressing should be pale yellow, smooth, and pourable.
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