You'll need:
3 slices fresh lime, quartered
Sprig fresh mint
Scant teaspoon sugar
2 oz vodka
Splash of lemon-lime soda
Layer the lime and mint in an old fashioned glass, then add the sugar. Muddle all until the limes have released their juice and the mint has been ripped to release their flavor. Add the vodka and ice and stir to combine. Splash in the lemon lime soda and garnish with a slice of lime and a sprig of mint (hint: if you just rip off the mint leaves, and keep the stem intact, you can keep the mint garnish above the rim of the glass [see the top picture]). Enjoy!