Clip the leaves from the stems and rinse. Then, spread them on a counter to air-dry for 30 minutes. Loosely layer leaves in a storage bag, and freeze.
Clip the leaves from the stems and rinse; spread them on a counter to air-dry for 30 minutes. Place the leaves in a blender or food processor, process for a few seconds to coarsely chop the leaves. Add enough water to form a slush and process again. Pour this liquid into ice cube trays and freeze. Once frozen, pop the cubes out of the trays and store them in a freezer container for later use.