Before starting, wash and heat jars and lids. We heat them in the canning pot because we need to have that heating anyway. Jars do not need to be sterilized because process time is over 10 minutes.
Start a large pot of water boiling in canning pot.
Once boiling add a few peaches to the pot for 30 to 60 seconds. (It depends one how ripe they are. Ripe peaches will take only 30 seconds, rare peaches more like 60 seconds.)
3½ cups chopped fresh peaches
Remove with a slotted spoon. Plunge directly in a cold water bath for 20 seconds.
Set up another large bowl with cold water with ½ teaspoon of ascorbic acid per gallon of water mixed in to prevent browning.
lemon juice or ascorbic acid
Peel skins off of peaches using a small paring knife. Cut in half. Remove pit. Slice peaches about ½ inch thick slices. Cut the slices directly over the bowl with the ascorbic acid.
Once all of the peaches are skinned and cut, replace clean water it the pot that you blanched them in. Bring to a boil. Add 6 cups to one gallon of water. Let the fruit boil for one minute, after the water has come back to boil.
Remove peaches from pot with a slotted spoon. Place them in a covered bowl or another pot to keep them hot.
Combine the water, sugar, clearjel and optional ingredients in a large saucepan. Stir and cook over medium heat until it thickens. (Don’t be concerned if the clearjel clumps. This is common. Just keep stirring until the clumps go away.)
1 cup Sugar, ¼ cup Clear Jel modified cornstarch, ¾ cup water