First you rub the entire outer, yellow peel of the lemons with a fine grater, then you squeeze it out and put the lemon peel together with the lemon juice in a saucepan. This mixture is then finely mashed.
Next, stir the gelling sugar into the cold liquid and bring it to a boil. The jam has to simmer for 3 minutes, then it is poured into jars rinsed with hot water.