It's an original cocktail created by myself for Terrapin Restaurant.
1 oz. Tito's Vodka
1 oz. Domaine de Canton
1 oz. Fresh Sour Mix (1 Cup Fresh Squeezed Lime Juice, 1 Cup Fresh Squeezed Lemon Juice, 1 Cup Simple Syrup, and the Zest of 1 Lemon and 1 Lime)
Fresh Grated Ginger
Pour ginger beer into a chilled martini glass. Add everything but the fresh grated ginger and lime zest to a cocktail shaker. Dry shake for 10 seconds. Add a small amount of ice to the shaker and shake vigorously for 20 seconds. Pour over ginger beer and grate ginger and lime zest over the top of the cocktail.