What additional flavoring is used in the Red Bull Sour Lime Slush apart from the sour?

The Red Bull Sour Lime Slush incorporates additional flavoring with simple syrup, which sweetens the drink and balances the tartness of the lime flavor while retaining that refreshing aspect. Simple syrup is a common ingredient in beverages that require sweetness, as it dissolves easily and enhances the overall flavor profile without overwhelming the other ingredients.

Options such as grape syrup, strawberry puree, and Sprite introduce different flavors that don't specifically align with the intended flavor profile of the Sour Lime Slush. Grape syrup would bring a fruity essence that diverges significantly from the lime focus. Strawberry puree would also alter the drink to lean toward a berry flavor rather than complementing the sour lime. Sprite, while fizzy, primarily adds carbonation and a citrus flavor that may not fit the profile of a slush meant to emphasize lime. Hence, simple syrup is the most appropriate choice for achieving the desired balance of flavors in this slush.