To beat and bake a meringue have cold, fresh eggs, beat the whites until frothy; add to each white one level tablespoon of powdered sugar. Beat until so stiff that it can be cut with a knife. Spread on the pie and bake with, the oven door open until a rich golden brown. Too much sugar causes a meringue to liquefy; if not baked long enough the same effect is produced.
The International Jewish Cook Book (1919).