Fill a shaker three-quarters full with ice cubes. Add 4 cl of Taunus-Tropfen, about half a lemon (squeezed) and a tablespoon of sugar and then shake vigorously (until the outside of the shaker “fogs” up). 

Then pour into a glass and squeeze with an orange peel. For the visual effect, it is best to add fresh ice cubes to the glass and use a strainer to leave the ice residue in the shaker.