1
Select and pre-chill a COLLINS GLASS.
2
Prepare garnish of quarter orange wheel (& optional mint sprig).
3
SHAKE first 8 ingredients with ice and strain back into shaker.
4
DRY SHAKE (without ice) to emulsify.
5
SLOWLY POUR two-thirds of the shaker's contents from a higher-than-normal height into a chilled empty glass (no ice in the glass) while simultaneously pouring soda with your other hand. (The cocktail and soda should form a single stream of liquid falling into the glass.).
6
As when pouring a Guinness, to achieve a perfect head on a Ramos Gin Fizz, LEAVE TO SETTLE for at least a minute. Ideally, during this settling period, the glass should be placed in a glass-froster/fridge/freezer.
7
POUR the final contents of the shaker into the glass. As you do so, the head should rise like a souffle.
8
Garnish with quarter orange wheel on rim (& optional mint sprig bouquet).