Snowdrift Pudding by Myrtle Peppin

From 1915:

Eating is not the most important matter in life, but it is a very good second in the lives of many.
My favorite recipe is snowdrift pudding made with the following ingredients:

One-half ounce of gelatin soaked in cold water; one-half pint of water; one-half pound of white sugar; the juice of four lemons, and whites of two eggs.

Dissolve the gelatin in water before beginning operations. Then add the sugar and the juice, boiling about ten minutes. Strain it and let it stand till cold, and it begins to thicken. Then add the whites of the eggs well beaten. Whisk briskly till all is very light and spongy. Pile in a high glass dish. Set it in a very cold place till served.