- 45 ml lemon juice
- 40 ml Tonic water
- 1 × sprig(s) of rosemary
- 40 ml Tanqueray gin
- 1 × lemon zest
Fill the iSi Soda Siphon or iSi Sodamaker Classic with cold water. Screw on 1 iSi Soda Charger and shake vigorously. If the water is particularly sparkling, cool in the refrigerator for 1-2 hours.
Fill a martini glass with ice cubes to cool it and discard the cubes immediately before serving.
Add Tanqueray gin, tonic water and lemon juice in the martini glass. Top up with soda water and serve with lemon zest and a sprig of rosemary.