oh my lol. I almost just fell outa my chair laughing... "Shake vigorously" She shouldn't be so rough with the shaker next time.
In all serious, its a nice recipe. The use of a citrus press would go a long way in changing the overall quality of the finished product though. The key is to get every last drop of juice out of the fruit, and INCLUDE it in the tin while "shaking vigorously" to break the fruit down further and get all those wonderful oils out of the peel.
Good drink though