We discovered this in Normandy. It replaces the champagne in a Kir Royale with cider as is fitting Normandy’s agricultural specialty. The splash of calvados (apple brandy) gives it a little extra kick.
2¼ oz hard cider
½ oz crème de cassis
½ oz calvados
Combine over ice in an old fashioned glass.
Alternate: Chill ingredients, and serve without ice in champagne flute.