Clean the mint by picking the leaves and discarding the stems.
Wash the leaves nicely under running water to get rid of any mud and chemicals.
Strain nicely to get rid of most of the water.
Spread the leaves on a large baking sheet or large plates.
Keep the plate in strong sun for 6-8 hours.
Grind the dry leaves in a blender to make a fine powder.
Store dry mint powder in an airtight container for up to an year.
Notes
You can also dry the mint leaves in a an oven. Heat the oven at 180 Degrees F (80 Degrees C).Spread the drained mint leaves on a baking tray and keep them in the oven for two hours.