I find instructions like "top up" extremely frustrating. Not everyone uses the same glasses and the same method to make. I often to multiple servings in one and then fill glasses with it. A guideline on how much ginger beer is recommended would be very useful.
I’ve revisited this cocktail and tweaked the recipe, to include a volume for the ginger beer. The previous recipe:
60ml (2oz) London dry gin
22.5ml (¾oz) Cherry (brandy) liqueur
45ml ( 1½oz) Orange juice (freshly squeezed)
Top up with Ginger beer