Rinse a martini glass with water and place the glass in your freezer for a couple of minutes to achieve a frost.
Meanwhile, fill a cocktail shaker with ice then get out a jigger or shot glass to measure the ingredients.
Pour one shot of vodka and one shot of St. Germain into the cocktail shaker. Then add 3 oz lemon lime soda and the juice from half of a fresh lemon.
Place the cap on the cocktail shaker then shake vigorously. For an extra-cold martini, place the cocktail shaker in the freezer for a few extra minutes to chill.
After your glass and cocktail have sufficiently chilled, pull both out of the freezer. Give the cocktail shaker a few additional shakes then strain ingredients into the glass.
Garnish with a fresh lemon wedge and enjoy!
Notes
Freeze a lemon slice in lemon juice to use as ice cubes for your cocktails! It looks pretty and won't water it down.