Place the zest and the juice into a very large stock pot
Add the water, ginger and the squeezed out orange rinds
Bring to a boil over a medium temperature
Remove from the heat and set aside to cool
When you can handle the orange rinds, scoop them out one at a time
Squeeze any juice still left in the rinds and then discard
Add this juice back into the pot, together with the fructose and the pectin
Dissolve the sugar while stirring constantly, over a low temperature
Once dissolved, bring to a boil over a high temperature
Leave to boil, skimming the scum with a slotted spoon
When the marmalade is
While doing the set test, remove the marmalade from the heat.
When you are confident the marmalade will set, leave to stand for 15 minutes
Stir well and then pour the marmalade into warm sterilized glass jars
Cover the marmalade with a disc of wax paper (wax side down)
Once completely cold, place the lid on the jars
Store for up to 3 months in a cold, dark place
Refrigerate once open
Notes
To do a set test place a teaspoon of the marmalade onto a saucer. Place the saucer into the freezer for 3 minutes. Then run your finger through the marmalade and if the indentation remains the marmalade will set. If not, return the marmalade to the heat, boil for 5 minutes and repeat until set.