Fresh mint can be easily dried and saved for later use when mint is not in season. When it is available, I always dry my mint leaves. To make dried mint leaves powder, sort the leaves and rinse them well. Then spread the leaves on a kitchen towel and allow them to dry somewhere where it is shady. Drying the leaves in the sun will cause them to turn black. It will take 3-4 days to completely dry the leaves. Once they are dry, they will become crisp. Rub the dried leaves between your palm to create a powder and then sieve the powdered mint leaves and store in an air tight spice jar for later use.