I had a student ask me a very important question the other day. “How long will the jam last after I open it and put it in the refrigerator?” I am so happy they asked this question. First, you may want to make jam in half pint sized jars so it won’t have enough time to go bad. You’ll eat it before it has time to spoil! I can with half-pint jars because sometimes, I get board eating the same canned goods – I want a different flavor. Sugar is the number one preservative in canned goods but sugar is not always a healthy choice. I use less sugar in my recipes which means that my jams and canned goods will have less preservatives and ultimately a shorter shelf life. I would prefer to healthy, great tasting food than have food that lasts forever.
You should always use clean utensils when canning. So many of us spread butter with a knife and then dip that same knife in the jam jar without realizing we have just contaminated the jam with foreign bacteria. That is how mold starts to grow in the jar. My personal rule for jams made with less sugar is 2 months in the refrigerator after being opened (but I’m sure you will eat them before then).
See you in class