This section is from the book "Mrs. Rorer's Diet For The Sick", by Sarah Tyson Rorer. Also available from Amazon: Mrs. Rorer's Diet For The Sick.
Two level teaspoonfuls of granulated gelatin soaked in a tablespoonful of cold water for fifteen minutes; add four tablespoonfuls of hot water, stir until the gelatin is dissolved, add a half cupful of orange juice and a level tablespoonful of powdered sugar, stir until the sugar is dissolved and stand the mixture aside until it begins to congeal, then with an ordinary wire egg-beater beat in the well-beaten white of one egg, turn it into a small fancy mold and stand away to harden. This may be served plain, or with a little extra orange juice.
Strawberry, blackberry and raspberry juice may be used in the same way.
 
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