Because I am all about drinks of the moment, I will give my mojito recipe. One piece of advice for DC Folks - mint grows like a weed. There is no reason why you have to pay for the damn stuff when you can poach it off your neighbors. Seriously, I do it all the time and my neighbors are happy I am taking it off their hands. Please email me if you want to know all of the prime mint poaching on Capitol Hill.
3 fresh Mint sprigs
2 tsp Sugar
3 tbsp fresh Lime Juice
1 1/2 oz Light Rum
In a tall thin glass, put in the sugar and mint and then crush part of the mint with a fork to coat the inside. Add the lime juice and stir thoroughly. Top with ice. Add rum and mix. Top off with *chilled* club soda (or seltzer). Add a lemon slice and the remaining mint, and serve.
You can do this in big pitchers as well but people won't have the springs of mint swimming in their glasses.