To Seal a Jar without a Canner with using Oven Method, you have to preheat the oven to 300 degrees F. After that, wash the Mason jars thoroughly and rinse with clean hot water. Then, Wash the fruit. You need to Split stone fruit in half. You can remove any stones or pits.
You must Put the fruit into the jar and use the handle of a wooden spoon to push the fruit down until the jar is full and the fruit is firmly wedged in place. Next, Place the sugar and 1/2 pint water into the small saucepan. You should bring to the boil and stir to dissolve the sugar. You can add another 1/2 pint water. You have to bring to the boil again.
Forth, pour the boiling syrup onto the fruit until it is within one inch of the top of the jar. You need to carefully knock the jar on the counter-top in order to remove any trapped air and top-up with syrup if necessary. After that, put the rubber seals and caps on the jars and not the screw-bands. Then, Place the jars on a baking sheet lined with newspaper in the center of the oven and heat for fifty to eighty minutes. Next, Remove from the oven and place on a wooden surface to avoid cracking.
You must tightly screw on the metal bands when still hot and allow to cool.