Soak the ground lemongrass into water for few hours. Strain.
well..you may use steam distillation. the oil comes from the leaves.
Extract in "vanilla extract" is simply the liquid extracted from the insides of a vanilla bean.
Extract means "to remove".
Yes you can. Extracts or flavorings are interchangeable, according to your taste.
yes, as long as the flavor you want to achieve is vanilla and not maple.