In a Kir Royale, what is combined with champagne?

In a Kir Royale, the cocktail is made by combining champagne with crème de cassis, which is a sweet blackcurrant liqueur. This combination results in a drink that has a delightful fruitiness complemented by the effervescence of the champagne.

Crème de cassis is known for its rich, dark color and strong blackcurrant flavor, which enhances the drink while maintaining the sophistication of the champagne. This balance of sweetness from the crème de cassis and the dryness from the champagne creates a refreshing and elegant beverage, making it a popular choice for celebratory occasions.

Other liqueurs like peach schnapps, triple sec, or grenadine, while they may also be used in various cocktails, do not match the traditional or flavor profile associated with a Kir Royale. Peach schnapps offers a sweeter, peachy flavor that does not complement champagne in the same way, while triple sec is a citrus liqueur that would not provide the same berry notes as crème de cassis. Grenadine adds a sugary, cherry flavor and syrupy texture that would alter the character of the cocktail significantly. Thus, the unique combination of champagne and crème de cassis is what defines the Kir Royale.