Slice off the eye of the coconut and drain. Fill with water and measure the amount of water you put in. Combine the rum and sugar (at a ratio of 2:1) to equal the amount of water. Stir until the sugar has dissolved and pour it into the coconut. Seal it with wax and store at room temp. for at least a month. Uncork and bottle. Serve as a cordial.
Serve in a Favorite Glass