In a tall glass, add the mint and simple syrup. With the handle of a spoon, crush and mash the leaves to extract the flavors. Fill the glass with the crushed ice and pour in the bourbon. Using a tea spoon, jiggle the contents to mix and chill. Garnish with fresh mint sprigs.
In a tall glass, fill with crushed ice. Add the Pimm's and sweet and sour mix. Stir to blend thoroughly. Splash with 7-UP and garnish with the slice of cucumber.