Cut the vanilla beans in half, then split each half in the middle vertically leaving them attached (about 2cm) at one end.
Add the vanilla beans to the jars.
Use a funnel to add the vodka.
Screw the lid on tight and shake gently.
Let them brew for around 12 weeks. Shake occasionally.
Notes
Homemade vanilla extract may be lighter than the store bought stuff. This may be due to the added ingredients or the process in which the store bought extract is made.
A great place in Australia to get quality vanilla beans from is Vanilla & Co.
Once the beans start showing, top up your bottle with some more vodka.
This vanilla extract does have a few flecks of vanilla seeds in it. If you do not like these, you can strain the vanilla through a sieve or strainer before using.
This recipe can be made with other alcohols such as white rum or bourbon.