In a shaker, muddle the lemon. Add the remaining ingredients and fill with ice. Shake, and double-strain into a rocks glass filled with crushed ice or one large ice chunk. Slap a mint sprig between your hands and use as garnish. Serve with a straw.
Watch expert bartender Erik Adkins make a proper Whiskey Smash in our How to Cocktail video.
Think you know the booze?
Let’s start with some basics.