Wash the oranges with hot
water and cut off the peel and
pith. Using a small sharp knife,
carefully remove and discard the
pith from inside the peel. Cut the
peel into thin strips about 2cm
long and 0.2cm wide. Put in a
large mixing bowl.
Cut the flesh of the oranges
into thin slices horizontally,
removing any pips, then cut
each slice into quarters. Add to
the orange peel along with the
rhubarb, then stir in the sugar.
Cover with cling film and leave to
macerate overnight.
Transfer the mixture to a
preserving pan or wide saucepan
and stir over a low heat until
the sugar has dissolved. Turn
up the heat and bring to a boil,
then reduce the heat a little and
simmer for about 20 minutes,
stirring frequently to stop it
sticking and burning, until thick.
Decant into new, clean, sterilised
jars, cover the tops with waxed
paper, seal and leave to cool.
Store in a cool, dark place for
up to 6 months. Once opened,
the jam will keep in the fridge
for 4 weeks.