Which ingredient is NOT usually included in a Margarita?

A Margarita traditionally consists of three main ingredients: tequila, lime juice, and triple sec (an orange-flavored liqueur). Tequila is the base spirit of the cocktail, providing the primary flavor, while lime juice adds tartness and freshness. Triple sec brings in sweetness and a hint of citrus to balance the drink.

Vermouth, on the other hand, is not a standard ingredient in a Margarita. It is typically associated with cocktails like Martinis and Manhattans, where it serves as a fortifying, flavor-enhancing component. The absence of vermouth in the Margarita highlights its unique flavor profile, which relies on the sharpness of lime juice and the distinct character of tequila. This makes vermouth an outlier in the context of this specific cocktail, aligning with the correct choice of ingredient that is not usually included in a Margarita.