Mix ingredients together in a blender (except the Angostura®), pour into a highball glass and stir with a Cinnamon stick. Leave refrigerated for an hour or longer. Pour into another glass topped with Ice and add a dash of Angostura® Bitters. Garnish if desired. A jug makes 4-5 servings dependent on the shape of the jug… so multiply accordingly on the amount of thirsty guests you have. (1.5 fl oz = 30 ml or 1 standard pour).