Grandma Salvina's Jam

Grandma Salvina's orange marmalade
Ingredients: 1 kg peeled oranges
650 or 700 gr sugar (depending on the sweetness of the oranges)
Method:
Peel the oranges, slice them, then pass them through a food mill using the coarse-holed disc.
Add the sugar to the orange pulp and let it rest, stirring occasionally to completely dissolve the sugar. Once the sugar is dissolved, cook for about 55 minutes. In the meantime, peel 3 oranges, avoiding the white pith, and boil the peels 3 or 4 times, changing the cooking water each time. Once boiled, finely chop the peels and add them to the orange pulp at the end of cooking, mixing everything together. Store the marmalade in sterilized and very hot glass jars, cover with a blanket until completely cooled.