01 - Fill a cocktail shaker with ice cubes.
02 - Pour vodka (or gin), lemon juice, and simple syrup into the shaker.
03 - Shake vigorously for 15 seconds until well chilled.
04 - Strain into a chilled martini or coupe glass.
05 - Twist the lemon peel over the drink to release oils, then garnish the glass with the peel.