Squeeze the clementines, put a good 400 ml of juice in a large saucepan. Peel the apples, grate coarsely and stir 400 g into the clementine juice, the grated apple will not discolour through the clementine juice. Mashed the bananas with a fork and add them.
It should make a total of 1 kg of fruit. Add a pinch of cinnamon and the preserving sugar and bring to the boil. Let it simmer for about 6 minutes. Immediately pour into clean jam jars and close.
Tip: I rinse the jam jars including the lids with high-percentage alcohol (rum) before filling them. If you love less sweet jams, you can of course also use preserving sugar 2: 1.