Rinse and dry the wintergreen leaves thoroughly.
Chop the leaves.
Please in a mason jar and cover with vodka. Put lid on top.
Place jar in a dark location for 6 weeks or more. Shake once every day or two.
Strain the vodka, add another cup of wintergreen leaves and allow to sit for another 6 weeks. Test for flavor. For very strong extract, you can repeat this step again.
Use as you would any mint extract.