It's the One Minute Mojito from FineLiving.com. Seems to me the muddling would push things over that one minute mark, but maybe not. The recipe is after the jump, but you can also watch the video that shows you how to make it.
4 lime wedges
2 to 3 tsp. Sugar
8 to 10 fresh mint leaves
2 oz. light rum
Put lime wedges, sugar and mint leaves into mixing glass. Use muddler to crush mint and lime. Put ice into the glass, and add rum. Pour into cocktail shaker and shake well. Strain mixture into a chilled Collins glass filled with ice. Top with club soda, garnish with 2 to 3 mint sprigs and serve.