Refrigerator Fruit Jam
I start with a small amount of sugar,if your fruit is very ripe and sweet you may not need additional sugar,just don't start out with too much.
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Slice a 1-inch wedge from the end of the lemon.Combine the fruit and the sugar in a large pot. Squeeze in the lemon and drop the rind into the pot. Heat on medium,mash the peaches a little until chunky. Don't mash the lemon.
Bring the mixture up to a boil, stirring frequently. When the bubbles become smaller ,about 5 to 8 minutes of boiling, start checking to see if the jam has set. Remove a spoon from the freezer and dribble several drops onto the spoon. Wait a few seconds, and then run your finger through the jam. If it leaves a track in the jam, it is done. If not, keep cooking the jam and test again a few minutes later,also taste the cooled jam in the spoon for sweetness. Add more sugar as needed for sweetness or a touch more lemon juice for acidity. Stir it into the jam and continue to cook until the set is reached. (If the jam is set when you tasted it but you want it a little sweeter, add the sugar and cook for a minute or two to dissolve.)Turn off the heat and carefully spoon the jam into the jar. Set it aside to cool, then screw on the lid,store it in the refrigerator, up to three weeks.