Wash the oranges and reserve the peel from 7 of them.
Remove the pith from the peel, cut the peel into strips and shred finely.
Remove the pith from the oranges and cut them up finely.
Put the shredded peel, orange pulp, water and Sure-Set in a large saucepan over a low heat until the sugar has dissolved, then bring to the boil and boil vigorously for 4 minutes. (See 'Adding Sure-Set' for details on boiling and timing).
Allow to stand for about 5 minutes, stirring occasionally to distribute the peel.
Pot and cover in the usual way; label and date. (See 'Potting and covering' for details).