What is the main ingredient in a Mimosa?

In a Mimosa, the main ingredient is Champagne. This classic cocktail is traditionally made by mixing equal parts of Champagne and citrus juice, most commonly orange juice. The sparkling quality of Champagne adds a celebratory feel to the drink, making it popular for brunches and various festivities.

The inclusion of vodka, light rum, or amaretto would alter the fundamental character of the Mimosa and steer it away from the classic recipe that most people expect. Other ingredients may be used in various cocktails, but for a Mimosa, the distinct effervescence and flavor profile of Champagne are essential, establishing it as the primary ingredient.