Which mixer is used in a Royal Flush shot?

The Royal Flush shot is a popular mixed drink that features a blend of flavors, typically including whiskey, peach schnapps, and cranberry juice. Cranberry juice is essential in this shot because it not only complements the sweetness of the peach schnapps but also balances the overall flavor profile. The tartness of cranberry juice adds a refreshing element, making the drink more enjoyable.

Each of the other mixers listed has its own unique flavor profile and use in different cocktails, but they do not contribute to the distinctive taste of a Royal Flush shot. For example, orange juice would introduce a citrus aspect that overshadows the other flavors; lemonade might make the drink too tart; and peach nectar would mismatch the intended balance, as peach schnapps is already included for a peachy flavor. Therefore, cranberry juice is the key ingredient that defines a Royal Flush shot.