Open the bottle of rum. Slice the vanilla beans lengthwise. Scrap the insides of half the vanilla beans and put it in the bottle of alcohol. Place all the vanilla beans in the bottle of rum.
Place the lid back on the bottle of rum. Give it a good shake, then place in a cool, dark place for a minimum of 8 weeks.
When ready to use, just measure right out of the bottle! Mangia!
Nutrition values are estimates, for exact values consult a nutritionist.