Put a small pile each of green, purple and gold sanding sugar on a plate, keeping them separate. Moisten the rim of a martini glass, then press part of the rim into each colored sugar. Combine the vodka, Grand Marnier and Baileys in a cocktail shaker with ice. Shake well, then strain into the prepared glass. Dust with cinnamon.
Photograph by Lisa Shin
Courtesy of Food Network Magazine