Because sour oranges can be difficult to find, Jennifer Colliau opts for bitter orange marmalade in her version of a sour orange soda. Slideshows: More Homemade Soft Drinks
Fill a cocktail shaker with ice. Add the marmalade, lemon juice and Black Pepper Syrup and shake well. Pour through a fine strainer into an ice-filled double rocks glass. Stir in the club soda and garnish with the orange slice and ground pepper.