Cut your vanilla beans lengthwise to expose the inner seeds, and place into a glass container of your choosing. To be considered a pure vanilla extract, the alcohol used should be 35% alcohol or higher, and you need to use a minimum of 100g of vanilla beans per liter of alcohol. 200g of vanilla beans per liter will make a double strength vanilla extract.
Add the alcohol to the bottle and shake.
Store out of the sunlight, and shake the contents occasionally. Your vanilla extract will progressively darken and take on a stronger vanilla flavour. It will be "ready" for giving as gifts in about a month.
As you use the extract, you can top it up with a little more alcohol. I like to occasionally add in a fresh vanilla bean or two, but it will last you for years even without.
Recipe printed from Oh, The Things We'll Make! Blog. https://thethingswellmake.com/homemade-pure-vanilla-extract/