Pour the sugar onto a shallow plate. Moisten the rims of the Martini glasses with the lemon wedge and then press the rims evenly into the sugar to frost. Place the glasses into the freezer for 10 minutes.
Half fill the shaker with ice cubes. Add the brandy, orange liqueur and lemon juice and shake vigorously for 10 seconds. Strain the Sidecar into the Martini glasses through a bar strainer. Garnish with lemon zest and serve immediately.
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