Crème de Cassis is a sweet, dark red liqueur made from blackcurrants. It is notably used in a variety of cocktails and mixed drinks due to its rich, fruity flavor. As a liqueur, it typically has a lower alcohol content compared to spirits, making it a versatile ingredient that can enhance the complexity of a drink without overpowering it.

One of the most famous cocktails featuring Crème de Cassis is the Kir, a simple yet elegant drink made by combining the liqueur with white wine. Another popular variation is the Kir Royale, which substitutes champagne for the white wine, adding a touch of luxury and effervescence. Crème de Cassis can also be used in more creative concoctions, offering a unique berry undertone that pairs well with a variety of other flavors.