Slice your cucumber into 5 or so slices.
Fill your Rocks glass with ice.
Toss 5 - 8 mint leaves into your shaker.
Toss 3 or so slices of cucumber into your shaker.
Measure .75 oz of simple syrup with your jigger and toss into your shaker.
Measure 1 oz of lime juice with your jigger and toss into your shaker.
Take your muddler and gently press and smash your mint and cucumber. Don't be too rough.
Add ice to the shaker, almost to the top.
Measure 2 oz of gin with your jigger and toss into your shaker.
Top the shaker off and shake it up for around 15 or 20 seconds.
Pull the top off and add the hawthorne strainer over the top of the shaker.
Pour your drink from the cocktail shaker into your rocks glass over the ice.
Place a cucumber slice on the glass rim and toss a few mint leaves on top as garnish.