This section is from the book "Cooking For Profit", by Jessup Whitehead. Also available from Amazon: Cooking for Profit.
Rule: One lemon and two eggs to each pie.
1 cup sugar.
2 cups water or milk. 2 lemons or 3 if small.
1/2 cup flour.
6 yolks of eggs.
Put the sugar in a saucepan and grate lemon rinds into it, squeeze the juice, add the pint of water and boil. Mix the 2 ounces flour with water and thicken the boiling syrup. Take it off and pour it gradually to the beaten yolks. Fill three pies and bake.
Whip the 6 whites, add 6 tablespoons sugar, spread over the pies while they are still hot in the oven and bake light-colored, A richer appearance may be given by dredging granulated sugar over the frosting before baking; it makes a crust. Too much baking will spoil the frosting, causing it to fall; also, be careful to get about a tablespoon of sugar to each white of an egg.
 
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