Wash apples, remove flowers and stems and chop the apples. Boil the fruits and 3/4 litre of water in a large pot covered for 20-30 minutes. Line a sieve with a gauze cloth and place the fruit pulp on top.
Let the juice drain well - but do not squeeze it. Let the apple juice cool down. Measure out 3/4 litre juice. Boil up with about half of the jam sugar, cinnamon stick, clove and lemon juice. Cook for 3 minutes while stirring continuously until bubbly.
Add the remaining jam sugar and bring to the boil again while stirring. Cook for 1 minute until bubbly. Remove the cinnamon stick and clove. Wash lemon balm, dab dry and pluck small leaves into the hot jelly.
Fill jelly brimful into prepared jars, close them tightly and turn them upside down for a short time to create a vacuum. Store in a cool and dark place.