Several chunks of watermelon (about 1 cup or so)
Combine watermelon, rosemary, and agave nectar in a cocktail shaker. Muddle.
Pour in a double-shot of vodka (I put a bit more, but telling you to do so feels irresponsible of me, do what you want) and put in a couple of ice cubes. Shake vigorously.
Strain into a martini glass, giving it a couple of good shakes to get the liquid past the watermelon mush. Garnish with a rosemary sprig.
emilymthompson.com | 24-Sep-2012