Evenly divide the vanilla beans amongst the containers you are using and pour the vodka over the top. Give the bottles a good shake.
Store covered in a cool, dark place for at least 4-6 weeks, shaking the bottles several times a week.
When your vanilla extract is ready to be used, strain out the vanilla beans and any residue, if you’d like. A strainer, cheesecloth, nut milk bag, or even a nylon stocking would all work just fine. If I’m giving the extract as a gift, I give it with the beans still in the bottle and with a date printed on the bottle for when it is ready to use.
The extract should be stored at room temperature and, like a fine wine, it will only get better the longer it sits.
Notes
For fun flavor variations, try your favorite bourbon, rum, or brandy instead of vodka.
For an alcohol-free vanilla extract, use vegetable glycerin instead of alcohol.
Play with various vanilla beans such as Tahitian, Madagascar, Mexican, and more. Each type of bean has its own subtle flavor profile. I personally find Madagascar beans to be the best for homemade extract and you get the most bang for your buck!
Buy your beans in bulk. Organic whole vanilla beans at the store can run upwards of $9.99 for a bean or two. Look on eBay, Amazon, and at bulk herb retailers.
You can also make one large batch of vanilla extract at once in a 1-quart container. Simply strain the vanilla beans out and divide the extract amongst the containers after it is ready.