In a cocktail shaker filled with ice, add spiced rum, lime juice and white cranberry juice.
Shake vigorously, then strain into two mule mugs.
Add ice to the mugs, then top them up with ginger beer.
Garnish with fresh cranberries and a rosemary sprig.
Notes
Use a copper mug or other metal mug to keep the drink ice cold.Add the ginger beer last so that it can bubble and foam to the top, making the best drinking experience.Instead of spiced rum, use your favorite spirit. Cinnamon whiskey and gin would be so good in this drink!