Here was my adapted spec, which I think worked really well:

Ingredients
* 4 oz ginger beer
* 1.5 oz gin (London Dry style - Tanqueray)
* 1 oz simple syrup
* 0.75 oz lime juice
* 8 mint leaves
* Garnish: mint sprig

Steps
* In a shaker, gently muddle the mint leaves, simple syrup, and lime juice. Add the gin and shake with ice. Double strain into a highball glass filled with ice. Top with ginger beer. Garnish with the mint spring.