Self-Preservation 2 (The technique)

Into a separate large pan put all the juice and the sliced peel (orange and lemon). Divide the water between the two pans, two thirds into the one with juice and peel.
Bring both pans to boil and simmer gently for 50 minutes

Leave to cool.

Using a nylon straining bag (or muslin), take the boiled pith/pip mush in small batches and squeeze as much thick juice (containing the important pectin) as you can into another pan. It’s messy... hands covered in juice, but keep going until the juice squeezing out maybe turns white. Put some real effort into it!