Harvest your leaves by snipping off the stem.
Wash gently to remove any bugs or dirt. Homegrown mint is a typical place to find cocoons of local bug life.
Dry thoroughly to remove any water. You can do this by leaving it out at room temperature and running a fan over it to speed up the process.
Slightly chop to “bruise” leaves to release oils.
Place clean leaves in a quart sized jar, packing tightly.
Cover with grain alcohol, such as vodka, leaving 1/2 inch headspace from the top of the jar.
Store in a cool, dark place for 2-3 weeks, shaking daily.
After 3 weeks, strain out the plant matter, and bottle your extract.