Now put everything in a saucepan and cook for about 5 minutes. To see whether the jam is ready, do the gelation test. Put about 1 teaspoon of the jam on a chilled plate. When the jam is ready, the sample will be firm on the plate after about 1 minute. If this is not the case, let the mixture continue to cook and, if necessary, do the gelling test again.
Then you can use a funnel to fill the jam into preserving jars. Please note that you close the glasses quickly and turn them upside down for 10 minutes.