1
Select and pre-chill a HIGHBALL (MAX 10OZ/300ML) GLASS.
2
Prepare garnish of Lemon zest twist and quarter orange slice wheel.
3
SHAKE first 4 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 ginger beer with your other hand. (The cocktail and ginger ale should form a single stream of liquid falling into the glass.).
6
As when pouring a Guinness, to achieve a perfect head, LEAVE TO SETTLE for at least a minute. Ideally, during this settling period, the glass should be placed in a freezer/glass-froster/fridge.
7
POUR the final contents of the shaker into the glass. As you do so, the head should rise like a souffle.
8
EXPRESS lemon zest twist over the cocktail and discard.
9
Garnish with quarter orange slice on rim.