To make spearmint essential oil, steam distill fresh organic spearmint leaves in a distiller. Collect the condensed oil and store it in a dark glass bottle away from sunlight. For a simpler option, infuse the leaves in a carrier oil, but this won't yield pure essential oil. Visit here:- https://www.essentialnaturaloils.com/blogs/natural-essential-oils/diy-peppermint-oil-a-step-by-step-guide-to-making-your-refreshing-essence