Wash the oranges well and cut into cubes with the peel. Then put the orange cubes with the citric acid and 1 liter of water in a large saucepan and let stand overnight.
The next day, place on the stove as it is and cook until the orange cubes are soft. Mix everything with a hand blender. Fill up with the sugar and the 7 liters of water and bring to the boil again.
Finally, fill everything into prepared bottles and close with rubber caps while still warm.
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