Blackcurrant liqueur, often known as crème de cassis, is a sweet, dark red liqueur made from blackcurrants. It has a rich, fruity flavor profile that is both tart and sweet, making it a versatile ingredient in the world of cocktails. The liqueur's deep color and intense flavor can add depth and complexity to a wide range of drinks, from classic recipes to modern creations.

In cocktails, blackcurrant liqueur can be used to create well-known drinks such as the Kir and Kir Royale. The classic Kir is made by mixing white wine with a splash of crème de cassis, while the Kir Royale uses champagne instead of wine. The liqueur's vibrant taste pairs well with other spirits and mixers, making it a popular choice for bartenders looking to add a unique twist to their concoctions. Its versatility also extends to non-alcoholic beverages, where it can be used to enhance the flavor of sodas, juices, and mocktails.