There are several alternatives that can mimic its sweet, fruity, and slightly tart flavor, though the specific taste of elderberries is unique. Here are a few possible alternatives: Blackberry Liqueur: This can be a good substitute as it has a similar sweet and tart profile. Chambord: This is a raspberry liqueur that's both sweet and slightly tart. It's widely available and often used in cocktails. Cassis or Crème de Cassis: This black currant liqueur has a rich, fruity flavor that can be a good stand-in for elderberry liqueur. Blueberry Liqueur: While not as common, blueberry liqueur can provide a similar berry flavor. Sloe Gin: This is not a direct substitute, but sloe gin has a fruity, slightly tart flavor that could work in some recipes.