What is the correct process for building an Iced Italian Soda?

The chosen answer outlines a clear and effective method for creating an Iced Italian Soda. It emphasizes layering the flavors into a clear tumbler, which is essential for visual appeal and allows the drinker to enjoy the vibrant colors of the syrup and carbonation. By adding soda water up to the mix line, it ensures the right balance between the syrup and the soda, which significantly impacts the flavor profile. The process of "tom-tomming" (a technique of gently mixing or lightly stirring) the ingredients is crucial as it combines them without losing the carbonation of the soda water, thus maintaining the drink's refreshing qualities. Finally, serving this blend in an iced cup keeps the drink chilled, making it more enjoyable, especially in warm weather.

The other methods involve either mixing or shaking the ingredients, which could diminish the carbonation or lead to an uneven flavor distribution. Properly layering and mixing in the tumbler ensures that the drink remains well-balanced and visually appealing.