Cut the lemons in half lengthwise, and then into thin slices, remove the pits. I had 3 very large lemons, so I cut them into 4 pieces and then into slices. Pour 3 glasses of water and leave overnight.
The next day, bring to a boil and cook for 10 minutes over moderate heat until the skin becomes soft.
Peel the apples from the core and, if desired, from the peel, cut into thin slices. Combine apples, lemons with liquid, sugar and...
... and mint. It doesn't need to be shredded, because eventually we will get it.
Stir and bring to a boil. Reduce the heat and cook for 30 minutes until thickened. Take out the mint and pour it into sterilized jars, roll it up. Enjoy your meal!