Rum Sidecar

I do not usually do much for Father's Day but this year I gave my spouse, who is really a top notch Dad, a set of really nice cocktail glasses, and between that, and a nice exposure to an interesting range of cocktails on our summer vacations this year, has led to an explosion of new and interesting cocktails, some of them complicated and some of them very simple, like this one.  Which is delicious.

• 1 1/2 ounces golden rum
• 3/4 ounce Cointreau or other triple sec
• 3/4 ounce fresh-squeezed lemon juice

In a cocktail shaker combine the ingredients with cracked ice and shake vigorously, then strain into a chilled cocktail glass with its rim rubbed with lemon lemon juice then dipped into sugar.