1 oz of Bacardi Limon Rum (or lemon-flavored rum)
1 oz of Absolut Citron Vodka (or citrus-infused vodka)
4 oz of 7-up soda (or Sprite)
Pour the Bacardi Limon rum and Absolut Citron vodka into a highball glass filled with ice cubes. Stir well, garnish with a slice of lemon, and serve.