Which ingredient is used to garnish a standard Margarita?

A standard Margarita is traditionally garnished with a lime. The lime serves both a functional and aesthetic purpose. Functionally, its acidity complements the flavors of the tequila, lime juice, and orange liqueur in the cocktail, enhancing the overall taste experience. Aesthetically, the bright green color of the lime adds visual appeal to the drink, making it more inviting. The lime wedge can also be used to rim the glass with salt, which is a common practice to elevate the drink's flavor. This combination of taste and presentation makes the lime an essential garnish for a classic Margarita.

Other ingredients like orange, strawberry, or mint are not typically associated with a standard Margarita, although variations of the drink can include different garnishes.