In a Sloe Gin Fizz, what is used to top the drink?

In a Sloe Gin Fizz, the correct ingredient used to top the drink is club soda. This choice is significant because the role of club soda is to provide the drink with fizziness and a light, refreshing quality, which complements the sweet, fruity flavor profile of sloe gin and the other ingredients, like lemon juice and simple syrup.

When mixing a Sloe Gin Fizz, the addition of club soda not only enhances the texture of the drink but also balances the sweetness, allowing for a more enjoyable sipping experience. Other mixers, such as 7UP, cola, and ginger ale, typically introduce different flavors and sweetness levels that would alter the intended taste of the classic Sloe Gin Fizz. Therefore, using club soda is essential in maintaining the drink's characteristic profile.