I have used this one before, turns out well.
Cuban Mojito recipe
the original authentic recipe from Havana Cuba
1 teaspoon powdered sugar
Juice from 1 lime (2 ounces)
4 mint leaves
1 sprig of mint
Havana Club white Rum (2 ounces)
2 ounces club soda
Place the mint leaves into a long mojito glass
and squeeze the juice from a cut lime over it. two ounces of lime juice, Add the powdered sugar, then gently smash the mint into the lime juice and sugar. (Use the back of a spoon)Add crushed then add the rum and stir, and top off with the club soda.Garnish with a mint sprig.