You can use either a used vanilla bean, after you have split it in two and scraped the seeds into another recipe (aka tasty custard for Boston Cream Pie). Instead, you can split a pod and scrape the seeds and add that to the sugar.
Drop the vanilla pod (and the seeds, if using) into a jar of sugar. Add a pretty label.
Let it 'steep' for a week or so, and then the sugar is ready to use! Use it as you would in tea, coffee, or in recipes.
Recipe by Kiku Corner at https://www.kikucorner.com/2014/11/11/how-to-make-vanilla-sugar/