For the apple-caramel jelly, mix 200 ml water with lemon juice. Peel and core the apple and cut into pieces. Add apple pieces to the lemon water.
In a saucepan, mix the remaining water with the sugar and boil until light brown caramel. Let it cool down a bit.
Pour the lemon water with the apple pieces to the caramel and dissolve it. When the sugar is completely dissolved, finely puree apples with a hand blender.
Mix with the cinnamon and clove powder and bring to a boil. Boil for 4-5 minutes. Boil jars and lids and add a few drops of rum to each jar and lid.
Pour the hot apple-caramel jelly into the jars and seal immediately.