Jenny Lind soup is a soup named for popular 19th-century singer Jenny Lind. It is typically a thick mixture with the consistency of wallpaper paste.
The dish is made from mashed rutabaga or sago, chicken stock thickened with a roux, Gruyère cheese, sage, egg yolks, and heavy cream, and topped with beaten egg whites. (This latter topping, unfamiliar to many, is a common tradition in French cuisine de famille, as it uses up the whites left over from using the yolks as a thickener).
In popular culture
Leopold Bloom, a character in James Joyce's Ulysses, fantasizes about it while lunching in the Ormond: "Jenny Lind soup: stock, sage, raw eggs, half-pint of cream. For creamy dreamy."