Not all cooking is a precise science but jam making really is. So instead I have converted the recipe to pounds and ounces and suggest if you want to achieve perfect results then a set of electronic scales really is the way forward.
My local supermarket was selling boxes of multi-coloured grapes and obviously bought in too many! Hence I found myself picking up a couple of boxes reduced to 90 p each from £3 (which was already a bargain for a kilo of grapes).
Grape Jam is shelf stable so will keep for years. However it will be in peak condition (for colour & flavour) in the first 12 months if stored in cool, dark, dry place. I keep mine in a cupboard in my garage.
I plotted out my Easy Grape Jam recipe and used my Simple Blueberry Jam recipe as a guide because blueberries and grapes are quite similar after all. Grapes just have tougher skins which is why the blending is necessary.
How long will Grape Jam keep for?
Once opened, store Grape Jam in the fridge where it will last many months provided you always use a clean spoon to serve it.
I didn’t find one recipe that told me all I needed to know, many used pectin and none said how long to boil the jam for, it was either “use a jam thermometer” or “boil until it looks right” and many recipes added water. I decided this wasn’t necessary as grapes are basically water in a skin!
I waited until the next day to try the jam and having heard so much about peanut butter and jelly I decided to give the family a cracker each with peanut butter and my Easy Grape Jam.
More summer jam recipes you should try!
So don’t think me mean when I don’t rush off to do the conversion for you, I just don’t want to be responsible for misinformation which could lead to inaccurate results.
Easy Grape Jam is the easiest grape jam recipe you’ll find – no peeling grapes here and no added pectin! With a taste that’s out of this world, this really is a jam recipe you have to try!
In the same, nonreactive saucepan, stir grape pulp together with sugar, pectin, and citrus juice and bring to a boil over high heat. Cook until the mixture registers 220°F on a candy or instant read thermometer.
Wash and stem grapes, removing any split or compromised ones. Don't worry if small stems remain on the fruit, since they will be strained out along with the seeds. In a nonreactive, heavy-bottomed saucepan bring grapes and water to a boil and then reduce to a simmer.
1/4 to 1/2 cup lime or lemon juice
Turn off heat and skim any foam with a spoon. Ladle jam into prepared jars, leaving a quarter inch of head space. Wipe the rims of the jar lids with a clean kitchen or paper towel and seal.
Set a food mill (with the smallest sieve in place) over a large, heatproof bowl or pitcher, and pour grapes and cooking liquid through. Mill until all that remains are the seeds, skins, and stems. You will have about 4 cups (32 ounces) of grape pulp.
Prepare boiling water canner and sterilize 5 half-pint jars by boiling them for ten minutes. Wash lids and rings and bring to a simmer in a separate, small saucepan of water. Turn off heat and allow jars, lids and rings to sit in hot water until you need them.
1 1/4 cups granulated sugar
3 tablespoons low sugar pectin