1.
Wash the oranges well and trim off the ends. Finely dice the fruit with the peel as finely as possible. Remove the seeds and put them in a small tea filter bag.
2.
Now weigh 1 kg of fruit cubes, put them in a large pot or bowl and fill up with 1.8 liters of water. Add the bag with the seeds and let steep for 24 hours in a cool place.
3.
Bring everything to a boil and simmer for about 1 hour. Let the mixture cool and steep again for 24 hours.
4.
You can now remove the bag with the seeds and squeeze it well. Weigh the mixture again and add about 650 g of gelling sugar per kg of fruit mass. Bring to a boil again and simmer for 1 hour. Perform a gelling test. The more seeds were in the bag, the less sugar can be added, as they help with gelling. If necessary, a little agar-agar can be added.
5.
Fill the mixture into hot, rinsed jars and seal.