In a large saucepan, add mint, pour in water and add lemon zest. Stir well and bring to a boil. Cover, turn off the heat and let it sit for 20 minutes.
Meanwhile, place a fine sieve over a bowl lined with cheesecloths; set aside.
Remove from heat and strain mint mixture through the prepared sieve. Gather the cheesecloth and gently but firmly, squeeze it to extract more juice; discard it. Return liquid to a saucepan and add lemon juice.
In a large bowl, add pectin and sugar; stir well. Add sugar mixture to infused mint mixture. Add peppermint extract and a few drops of green food coloring. Stir again and bring the mixture to a boil; cook for 2 minutes. If there’s foam on top, skim it off with a spoon. Reduce heat to medium and cook for 10 minutes.
Transfer mint mixture to prepared jars and process them in a water bath for 15 minutes.