Salad Dressing

• Yolk of one egg
• sugar
• salt
• 1/2 tablespoon prepared mustard
• 1/4 cup milk
• 1/4 cup vinegar

Beat the yolk, sugar and salt well. Then stir in thoroughly each ingredient. Boil long enough to thicken a little. Stir long enough only to keep smooth.

The recipe as I have it doesn't say how much sugar or salt (they weren't even in the ingredients list.) From a quick look online, I'd guess 1 or 2 tablespoons sugar (some recipes use up to a cup!) and 1/2 to 1 teaspoon salt. This would a dressing for potato salad or cole slaw, maybe a substitute for mayonaise.

Prepared mustard means the wet kind we usually buy today. Mustard also comes in dried seeds or powdered, which were the normal kinds years ago. You had to grind the seeds and mix the powder with oil and vinegar to get prepared mustard. Sometimes mustard came in bricks—the seeds were ground while wet, pressed into cakes and then dried, so you had to grate the cake before preparing the mustard.