Put the juices together with 4 ice cubes in a shaker and close the shaker. Shake firmly for 15 seconds. Pour the contents of the shaker through a strainer into a long drink glass on 2 - 3 ice cubes. Top up with ginger ale and mineral water.
Decoration tip: Peel 1 lemon slice in half with the peeler so that a spiral remains on it. Cut into the bowl and stick it on the edge of the glass.