What is the primary characteristic of a Pousse Cafe?

The primary characteristic of a Pousse Cafe is that it layers multiple liqueurs from heaviest to lightest. This distinctive layering is achieved by carefully pouring each liqueur over the back of a spoon, allowing them to remain separate and create a visually appealing drink. The technique highlights the different colors and densities of the liqueurs, making the Pousse Cafe a striking presentation that emphasizes craftsmanship in bartending.

In contrast, serving the drink in a tall glass with ice would not align with the traditional method of presentation for a Pousse Cafe, which is typically served without ice to maintain the integrity of the layers. The inclusion of a fruit garnish is not a defining feature of this type of drink, as the focus is on the presentation of the liqueurs. Lastly, being served warm is not a characteristic associated with Pousse Cafe; it is generally enjoyed cold. The layering technique is what truly defines this drink and what makes it unique among cocktail preparations.