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How to keep mint leaves fresh
Wash the mint gently.
Run the mint under a stream of cold water, being careful not to damage the delicate leaves. Shake off any water droplets clinging to the leaves and stems and set the mint on a layer of paper towels.
Herbs should always be washed before use or storage, as they can contain traces of dirt and bacteria or residue from pesticides and fertilizers. Turn the faucet on to a light drizzle so that the stream of water is not so heavy.