Carefully, using a sharp knife, slit the vanilla beans so the beans are exposed. No need to completely split the bean in half, just slit down the middle. If the length of the vanilla beans don’t fit into your bottle, cut the vanilla beans into smaller pieces. Place beans into bottle.
Using a funnel, pour your vodka on top of vanilla beans. Use a little extra vodka, if needed, so the beans are fully submerged. Shake a few times.
Store vanilla at room temperature out of direct sunlight. Shake about once per week or once every couple weeks. Vanilla can be ready to use in as little as 8 weeks, but I highly recommend waiting at least 6 months for optimal flavor. 12 months is even better!
As you begin to use your vanilla, you can refill with a little vodka each time. Give it a shake after you refill and give it a shake before each use, too. If you’re gifting the vanilla or if you don’t have any more alcohol to refill, remove the beans completely after first use. The beans will become a little slimy if they aren’t almost fully submerged.