We've had a few attempts at making orange marmalade using Seville oranges that are in season right now.
The problem we've had is in reaching the setting stage. We've boiled up the marmalade up to the setting point, but the "wrinkle test" has refused to produce wrinkles and we're getting overly gloopy marmalade at the end (delicious though it is). We're reasoning that there's somehow not enough pectin.
So, if we reach the boiling point and fail to "wrinkle", can we add more pectin at this stage to ensure setting, or would it be far too late at this point?
Best Answer
There's no problem adding pectin later in the process, you just have to be careful how you do it depending on the form. Powdered pectin can glob up if you just pour it in, mixing it with a bit of water or cooled marmalade from your pot will prevent this. Pectin sugar or liquid pectin mixes can be added without any issues.
The thing is you shouldn't need to add pectin as seville oranges are naturally very high in pectin, if you aren't getting a set then it's likely a problem in your technique or not enough sugar or acid. This very good article on marmalade has some good suggestions:
Also, make sure you have enough acidity and sugar, you generally have to add some lemon juice to marmalade as there isn't enough in the oranges naturally. If you have overcooked the pectin you can add some in, just remember to keep the temperature down and not cook it to long. As soon as you get a decent set get it off the heat.