Chill your martini glass in the freezer or fill it with ice water while you prepare the drink.
In a cocktail shaker, combine vodka, triple sec, lemon juice, simple syrup, and a splash of cranberry juice.
Fill the shaker with ice and shake vigorously for about 15 seconds.
Empty the martini glass and rim it with sugar by rubbing a lemon wedge around the edge and dipping it in sugar.
Strain the mixture into the prepared martini glass.
Garnish with a lemon wedge or twist and serve immediately.