Runny marmalade - how to fix?

[Mette]

I made 8 kg.s of seville orange marmalade and it was a bit of a rush job - and now it's too runny and won't stay on the toast, which is it's calling. How can I fix it?

I see the following options:

reboil for a thicker set - but will this destroy the pectin?

Reboil and add pectin - how do i calculate the pectin ratio?

Use for dessert sauce - we'll be eating the stuff till kingdom come :-)

Help - sourcing the oranges has been very difficult and I really want to fix it!

Thanks

[Panaderia Canadiense]

Reboil. It doesn't destroy the pectin (at least, not in my experience) but it will thicken up the marmalade.

[Mette]

Thanks, worked a treat. Must have boiled off at least a liter of water, and as a bonus, theres been some maillard-action, to give the marmalade a lovely, dark amber colour.

[TheSugarChef]

I've found it helpful to test my jelly on a chilled plate before I take it off the heat. It really drives me crazy when it's runny the next day and I'm doing double the work. And I've had enough disasters to practice this habit with all of my sauces, caramels and glazes.