During the war when food became scarce in South egg whites and butter mixed to make a substitute for what beverage additive?

During wartime, when food became scarce, South egg whites and butter were mixed to make a substitute for cream.

This mixture, often called "mock cream," was used to add richness and a creamy texture to beverages like coffee and tea, as well as desserts. While not a perfect substitute for real cream, it provided a palatable alternative when dairy products were in short supply.