The great thing about a copper cup, is that it will hold its temperature better than a glass one, so pop that thing in the freezer about 10 minutes before whipping up the cocktail
Place 100g of Ice Cubes into your chilled metal drinking vessel (or other receptacle)
Add 50ml of Vodka, pouring it over the Ice
Drop in 15ml of Fresh Lime Juice
Top up with 100ml of your favourite Ginger Beer and give the whole thing a quick stir
Garnish with a slice of Lemon wheel, and if your feeling fancy, add an additional sprig of rosemary
Consume at your leisure