I made my first batch of Rhubarb and Raspberry jam last night and feel a few things went wrong, but am unsure..
Firstly i didn't add enough sugar initially, and therefore had to add more to set it, after already boiling it for at least 20 mins. I didn't use pectin as was determined to try making it without, so forced to add the extra sugar to set. I now worry that i over cooked the fruit and lost its flavour...
Secondly I used standard (boiled) jam jar lids (not the mason kind) to seal the heated jars and turned them upside down to cool. All seemed fine. This morning i decided to check the lids were definitely screwed on properly, using a jar wrench. 7 out of 9 jars made a "popping" sound when tightened and now i worry i've ruined them. Been trying to find an answer online, but all i can see if that people advise against using the jar wrench, however with no reason why.
Can anyone help??