Exactly as printed, 1928
Mix two egg yolks, one teaspoonful of dry mustard, a teaspoonful of salt, a little cayenne, and two tablespoonfuls of vinegar in a small bowl.
Now add one and a half cups of mineral oil. Put the oil in, a teaspoonful at a time, beating with an egg beater until the dressing begins to thicken and then add by the tablespoonful, beating slowly until you have a thick mayonnaise. This mayonnaise is good for a reducing diet.
Cook and Be Cool, 1928. Public domain; transcription unaltered.