With iSi Whipper dispense Foam (see notes) into chilled glass
Strain cocktail into glass, through the foam
Notes
Foam:3oz (90ml) Elderflower Liqueur 1.5oz (45ml) Lemon Juice 1oz (30ml) Water 2 Egg WhitesCharge the iSi whipper with NO2 cartridge(s) and let sit in refrigerator for at least 30 minutes before using.