What is "prune whip"

Usage examples of "prune whip".

Smith returned a spoonful of prune whip yogurt to the white porcelain dish on the silver tray.

Smith was left with a breakfast of prune whip yogurt, a half grapefruit, black coffee, dry toast, and a morning newspaper talking about the strange attacks at the White House and the mysterious sudden presidential trip to Europe.

After the war I went away to school and I discovered fancy eating, like creamed chicken and peas, and prune whip.

For dessert there are three delicacies, each from a recipe handed down through Gwendolyn Savage's family, the Makepeaces of Raleigh, North Carolina: a pumpkin pie with whipped cream, an airy prune whip, chocolate puddings in fluted little half pint cups.