Wash oranges, tear off 2 or 3 pieces of zest and set aside. Peel the ginger and cut into the finest cubes. Peel the oranges carefully and cut them into cubes, yields about 1.5 kg of prepared pulp.
Put the orange cubes together with the orange juice in a sufficiently large saucepan, the total mass should be around 1,800 g, mix with the 2 tablespoons of sugar. Let the whole thing simmer for about 5 minutes and then roughly puree.
Then add the preserving sugar, the zest and the ginger and cook for 4 minutes (or according to the preserving sugar instructions). Pour hot into prepared glasses.