Which cocktail is known for using muddled mint and sugar?

The cocktail that is famous for using muddled mint and sugar is the Mint Julep. This classic cocktail is particularly associated with the American South and is most famously served at the Kentucky Derby. The preparation involves muddling fresh mint leaves with sugar (typically simple syrup) in the bottom of a glass, aiming to release the essential oils from the mint. This mixture is then combined with crushed ice and bourbon, resulting in a refreshing drink that perfectly balances sweetness and minty freshness.

In contrast, while the Mojito also features muddled mint and sugar, it is primarily a rum-based cocktail and adds lime juice and soda water, making it distinct in both flavor and presentation. The Whiskey Sour focuses on whiskey, lemon juice, and sugar, without any mint, which differentiates it further from the Mint Julep. Pimm's Cup is a fruit-based cocktail that doesn't traditionally include mint muddled with sugar as its primary components. This distinction highlights why the Mint Julep stands out in its use of these specific ingredients.