New Orleans Gin Fizz
Lemon slice & mint sprig
1. Vigorously SHAKE first seven ingredients with ice and pour back into shaker. DRY SHAKE (without ice) and fine strain into chilled glass (no ice in glass). TOP with soda from siphon.

ALTERNATIVELY, 2. Flash BLEND first seven ingredients without ice (to emulsify mix). Then pour contents of blender into shaker and SHAKE with ice. Strain into chilled glass (no ice in glass) and TOP with soda from siphon.
[['6.75 cl', 'Portobello Old Tom gin'], ['1.5 cl', 'Lemon juice (freshly squeezed)'], ['1.5 cl', 'Lime juice (freshly squeezed)'], ['2.25 cl', 'Sugar syrup (65.0°brix, 2 sugar to 1 water rich syrup) (2 sugar to 1 water)'], ['0.5 cl', 'Orange flower/blossom water'], ['3 cl', 'Pasteurised egg white'], ['3 cl', 'Single cream / half-and-half'], ['Top up with', 'Soda from siphon']]
[['6.75 cl', 'gin'], ['1.5 cl', 'lemon juice'], ['1.5 cl', 'lime juice'], ['2.25 cl', 'sugar syrup'], ['0.5 cl', 'orange flower/blossom water'], ['3 cl', 'egg white'], ['3 cl', 'single cream / half-and-half'], ['Top up with', 'soda from siphon']]