All you need is 3 mint leaves, 1 lime wedge, 1 oz white rum and diet lemon/lime soda (I like Sprite Zero). To make, muddle the mint leaves with the rum and juice from the lime. Run the squeezed lime wedge around the rim of the glass. Dip the rim of the glass in a shallow dish of sugar to coat the top. Pour the muddled mixture into your glass, fill with ice and diet lemon lime soda.