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Heat the oven to 275 F/130 C. Lay a double layer of newspaper on each oven shelf but not the oven floor.
Arrange the jars on the oven shelf, making sure the jars are not touching each other. Close the oven door and sterilize the jars for a minimum of 20 minutes.
Using thick oven mitts, remove each jar from the oven as needed on a heatproof mat or heat pad.
Fill your dishwasher with clean cold jars and run a minimum rinse wash to time the ending with when your jam, preserve, or pickle will be ready.
Use the jars one at a time and fill the hot jars with the jam or preserve that's just as hot.
Clean the jars as usual, rinse them, and leave them slightly wet. Microwave the jars for 30 to 45 seconds, depending on their size.