1/4 Granny Smith apple
5 to 6 mint leaves
22.5 ml (.75 oz) orgeat
15 ml (.5 oz) fresh lime juice
60 ml (2 oz) Tanqueray No. TEN gin
7.5 ml (.25 oz) green Chartreuse
1 mint leaf, as garnish
Muddle the apple, mint, orgeat, and lime juice well. Add ice and the remaining ingredients. Shake hard and double-strain into chilled cocktail glass. Add the garnish.