This section is from the book "Cooking For Profit", by Jessup Whitehead. Also available from Amazon: Cooking for Profit.
2 raw yolks of eggs.
1/2 teacup olive oil.
About half as much vinegar or lemon juice.
A level teaspoon salt.
Same of made mustard.
Pinch of cayenne.
Put the two raw yolks in a pint bowl, add two tablespoonfuls of oil, set the bowl in ice-water or otherwise make it cold, and beat with a Dover egg-beater about a half a minute. Then add more oil and whip, and then throw in the salt, and on whipping again the mixture will at once thicken up, looking like softened butter. Then add a spoonful of vinegar, then oil and so on alternately till all is in. Add the mustard and cayenne for seasoning. The best mayonaise is made with lemon juice instead of part of the vinegar, and when it will not thicken as desired the lemon juice invariably corrects the trouble and gives the dressing the desired consistency. It should not be thin enough to run, but should coat over the pile of salad material it is spread upon. The foregoing shows the quickest method of making this important sauce or dressing; the egg-beater or the want of it need not, however, be an obstacle in the way, for simply stirring around in the bowl with a wooden spoon is the way most commonly practiced.
 
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