The classic accompaniment to roast lamb. Make this jelly in the summer when mint is plentiful and aromatic. Please read About Making Jelly and How to Process.
Place in a large heavy saucepan and thoroughly crush:
Bring to a boil over high heat. Remove from the heat, cover, and let stand for 10 minutes. Extract the juice. While the juice drains, prepare a water-bath canner, gather all your canning equipment, put a couple of saucers in the freezer, and have ready 4 sterilized hot half-pint jars.
Measure the strained juice: You should have about 1 ¾ cups; add water if necessary. Return the mint juice to the saucepan and add:
Bring to a boil, stirring constantly. Add:
Boil hard for 1 minute. Remove from the heat and skim off any foam. Use the wrinkle test to make sure the mixture has reached the jelling point. Pour into the jars, leaving ¼ inch headspace. Wipe the rims. Place lids on jars and screw on rings until fingertip-tight. Process for 5 minutes. Let cool completely and store as directed.