Wash the smallest apple, grate dry and cut in half. Cut one half into thin slices. Sprinkle with 1 tsp. lemon juice. Juice the rest of the apples (even half of them) in a juicer. Mix 900 ml apple juice with jam sugar and lemon juice and bring to the boil.
Cook for 4 minutes until bubbly. Add apple slices for the last minute. Wash the lemon balm, dab dry and cut the leaves into thin strips. Add Calvados and lemon balm. Pour jelly into prepared glasses and close them immediately
2 hours waiting time