To make the extract, purchase some good quality vanilla beans and good quality vodka. You don’t have to get top shelf, but don’t get “lighter fluid” vodka either.
Split the beans open and scrape all of the wonderful seeds out. Drop them into a bottle of vodka. Then drop the split bean pods into the bottle as well. You’ll want about 2 beans for every cup of vodka that you use. I’ll tell you though, that any time I use vanilla beans for another recipe, I’ll toss those pods into the bottle as well. It won’t hurt a thing and will only boost the vanilla flavor in your extract.
Place the bottle in your pantry and leave it be. Once in a while when you go into your pantry for something, give the bottle a shake to move the beans & seeds around in there.You want to let these to steep for at least 4 or 5 months, but you can leave it in there indefinitely.