A fool is an English dessert generally made by mixing puréed fruit, whipped cream, sugar, and possibly a flavouring agent like rose water.
Foole is first mentioned as a dessert in 1598 (together with trifle), although the origins of gooseberry fool may date back to the 15th century. The earliest recipe for fruit fool dates to the mid 17th century. Why the word "fool" is used as the name of the this fruit dessert is not clear. Several authors derives it from the French verb fouler meaning “to crush” or “to press” (in the context of pressing grapes for wine), but this derivation is dismissed by the Oxford English Dictionary as baseless and inconsistent with the early use of the word.
Originally the most common fruit ingredient in fools was gooseberries, although other fruits and berries are known from early recipes, e.g., apples and raspberries. Modern recipes may include any seasonal fruit readily found, but gooseberry fool remains the perennial favorite.