Elderflower and lychee are not similar in flavor, but they both have unique and delicate tastes that can add complexity to drinks and dishes. Elderflower has a floral, slightly sweet, and somewhat musky flavor. It's subtle and fragrant, with a hint of creaminess. On the other hand, lychee is a fruit with a sweet, slightly tart flavor that's often defined as a cross between a pear and a grape with subtle floral undertones. While they both have floral notes, elderflower's flavor is more herbaceous and botanical, whereas lychee has a more distinct fruity sweetness. They can both be used in cocktails, desserts, and some savory dishes, but they will give the food or drink a different character. Substituting 1 for the other in a recipe will change the flavor profile.