This sauce when cold is an excellent and economical substitute for the more expensive mayonnaise.
PART 1.--Put one ounce each of butter and flour into a sauce-pan over the fire, and stir until it is melted, add gradually half a pint of boiling water, season with a teaspoonful of salt, and quarter of a saltspoonful of white pepper, stir till smooth, and set a little away from the fire, while you make the following sauce.
PART 2.--Put the yolk of one raw egg in a salad bowl, add a quarter of a saltspoonful of salt, half that quantity of grated nutmeg, as much cayenne as you can take up on the point of a very small pen-knife blade; mix these ingredients with a wooden salad spoon thoroughly, and then add, a few drops at a time and alternately, three tablespoonfuls of oil, and one of vinegar. Pour the preparation marked part 1, into this, gradually stirring until the sauces are thoroughly mixed; cool and use. This sauce will keep for weeks in a cool place.