This is how I've been making this jam for a long time (you can make this in a pot too). If you are making half the amount, also use half the cooking time.

This jam is low in sugar. If you are storing it for a long period of time, add 50% more sugar. The consistency of the jam will differ depending upon the sugar content. The jam will be a bit runny at first, but it will thicken on the next day. If you are unable to boil the jar in water, simply sterilize with boiling water. Recipe by Yuuyuu0221.