Moisten the rim of each chilled glass with the lemon wedge; gently press each rim into the sanding sugar. Fill a metal cocktail shaker with cracked ice; place the top on the shaker and shake for about 10 to 15 seconds.
Add the vodka, Triple Sec, lemon juice, and superfine sugar and shake for another 15 seconds. Strain the liquid into the prepared glasses and serve immediately garnished with a twist.
Serves 4
