Step five:
Boil hard for 5-10 mins until the jam has reached 105C on a preserving or, digital thermometer then turn off. The heat. If you don 't have a thermometer spoon a, little jam onto one of the cold saucers. Leave for 30 secs then push,, With your finger; if the jam wrinkles and doesn 't flood to fill, the gap it is ready. If not turn the, heat back on and. Boil for 2, mins moreThen turn off the heat and do the wrinkle test again. Repeat until ready.
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