Rinse and pat dry the mint leaves.
Gently bruise the leaves to release their oils.
Place the bruised mint leaves in the glass jar.
Pour the cup of vodka over the leaves, ensuring they are completely submerged.
Seal the jar tightly.
Store in a cool, dark place away from direct sunlight.
Shake the jar gently every couple of days.
After 6 weeks, strain the extract through a coffee filter or fine mesh strainer into a dark bottle.
Label your bottle with the contents and date.
Use in your favorite recipes for a fresh mint flavor.