Between The Sheets
Here's an oldie and a potent one that has an interesting name. Try substituting apricot brandy or peach schnapps for the brandy. It gives it an updated fruitier flavor.
3/4 oz. Rum
3/4 oz. Brandy
3/4 oz. Cointreau
Splash of Fresh lemon juice or sour mix
Shake over ice. Strain into a chilled cocktail glass. Garnish as desired.