Place the mint leaves in a mortar and pestle and muddle until leaves are broken down to about half their size. Alternatively, rub the leaves between your palms until all of them are broken down.
Transfer muddled mint to a heat-proof jar and pour hot (boiling) water over it. Cover with a lid or small plate and let steep for 5 minutes.
Strain the tea and serve hot or pour over ice. Will keep strained in the refrigerator for up to a week. You can also pour it in an ice cube tray and transfer to the freezer to keep for longer.
Notes
*Nutrition information is a rough estimate with fiber content removed since the leaves will be strained out.