Using a vegetable peeler, pull a long thin piece of peel from clementine. Avoid pith as much as possible. Cut a thin slit in centre of peel and reserve. Squeeze juice from clementines into a small bowl. Fine strain 1 oz juice and pour into a cocktail shaker. Add vodka, Grand Marnier and bitters. Add a handful of ice. Top with lid. Shake and strain into a chilled coupe glass. Gently twist reserved peel over drink, releasing oil. Garnish edge of glass with reserved peel.
Recipe adapted from: Walsh, Victoria. "Christmas Clementine Drop." Food & Drink. Holiday 2014.