
For as long as I can remember, my Grandma has made wonderful grape jelly and jam. I think the secret ingredient is the Concord grapes that her Dad, known to our family as "Big Bob," planted 62 years ago. There are actually vines in two different areas of Grandma's yard, and they seem to alternate years when they produce a lot of grapes.
Uncle Bob and I picked a lot of grapes, but a lot were still green, so we weren't sure we'd have enough ripe grapes for a good batch of jam. But I'm glad to report we did!

Grandma says the best time to do this is a day ahead, so the grapes can dry thoroughly.

We washed the jars and then put them in the oven to sterilize.
Grandma's recipe has just two ingredients -- Concord grapes and sugar, in equal amounts. Our first batch was 8 cups of Concord grapes (packed firmly into the measuring cup) and 8 cups of sugar. I know that sounds like a ton of sugar, and it is, but I realized why it called for so much sugar when I tasted one of the grapes. They are very tart!
The photo above is what the mixture looked like when we first put it in the pot. It looked like we used some green grapes, but those are really the grape innards that had separated from the skins when we plucked them from the stems.

Then you let it boil, stirring frequently, for about 20 minutes. Then we processed it through a food mill. The jam dripped into the bowl and we discarded the solids.
Then we returned the mixture to the pot and boiled it for awhile longer (10 - 15 minutes?). Every so often Grandma would use a spoon to see if the jam coated the spoon and looked thick as it dripped off the spoon. Eventually she pronounced it done.
After that, we ladled the jam into jars. Grandma doesn't have a canning funnel so it was quite a mess. (I have one that I have never used -- I wish I had brought it with me!)
Then we poured hot paraffin on top of the jam. I'm don't think paraffin is currently the recommended canning method but that's the way Grandma has always done it and it hasn't ever made anyone sick. But do this at your own risk! Once the paraffin was hard, we washed off the jam that dripped on the jars and put on the tops. (I am keeping all of my jars of jam in the refrigerator to be on the safe side.)
