Split vanilla beans down the middle leaving about 1/2 inch at each end and cut the bean in half.
Add to a clean sterile jar.
Pour in the vodka and seal jar.
Give it a good shake.
Store in a dark cool place for about 6 - 8 weeks or longer. (The longer the better)
Once or twice a week give the jar a good shaking.
You can remove the beans and strain it to get the store-bought look or just leave the beans in there to continue to mature.