There is not a detailed recipe for making vanilla extract at home. All that you need is one vanilla bean, alcohol and patience. I like to use Vodka for this preparation because it has a neutral flavor but you can use other liquors with a high percentage of alcohol (like rum). All the alcohol does is absorb the flavor of the vanilla bean. The longer you leave the preparation alone to extract the flavor, the more potent it becomes
1 vanilla bean
about 1 cup vodka
1 small jar with tight lid
Split the vanilla bean. You don't need to scrape it.
Place the vanilla bean in a jar and cover with vodka.
The vanilla will get quite dark after a while (3 months), but I usually leave it for 6 months before using it.