MAYONNAISE SAUCE.?This is the most delicious of all cold sauces. It is
composed entirely of raw yolk of egg and oil, flavoured with a dash of
vinegar. When made properly it should be of the consistency of butter in
summer time. Many women cooks labour under the delusion that it requires
the addition of cream. Mayonnaise sauce is made as follows:?Break an egg
and separate the yolk from the white, and place the yolk at the bottom of a
large basin.