This is like the homemade vanilla made with brandy, or this is made with rum. It's extra potent and You can make it with vodka also. Because of their mutual tropical origins because good wood aged rum often has flavor notes of vanilla, the two are natural partners. As the level of vanilla in the bottle drops, you can add more rum up to another half cup or so before starting over.Source: Unknown
split the vanilla beans lengthwise, then cut them in half crosswise.
In a glass jar mix 4 of the vanilla bean pieces and the rum. Cover and let mixture stand at room temperature, shaking the bottle occasionally, for two weeks. Store in a cool, dark place, the vanilla rum will last for one year. Use it as you would any good vanilla extract.