Put some confectioners' sugar on a plate. Rim a cocktail coupe or martini glass by rubbing the lemon wedge lightly around the rim, then dipping the rim into the confectioners' sugar.
Put the vodka, Cane Sugar Simple Syrup, lemon juice and turbinado sugar in a cocktail shaker, add large ice cubes and shake vigorously. Add the sparkling white wine and tumble roll (pour back and forth between two containers) once to mix throughout. Double-strain into the prepared glass, add a lemon slice to garnish and serve immediately.
Combine the sugar and 1 cup water in a small saucepan and bring to a boil. Cook, stirring, until the sugar dissolves. Remove from the heat and let cool completely. Keep covered in the refrigerator up to 1 month.