Discover the secret to dry pasteurizing preserves in your oven

My neighbor can pasteurize about a dozen jars at a time. When I asked her where she buys such large pots to fit everything, she snorted with laughter. It turned out that she has been using a different, yet equally effective method for a long time.

Pasteurization is a process in which food is subjected to thermal treatment. This allows food products to be stored longer and significantly reduces the activity of microorganisms, such as bacteria, yeast, and molds. At home, jars are usually pasteurized using a pot of boiling water, but recently, an alternative, even simpler method has been gaining popularity.

Dry pasteurization is a preservation method using an oven. As the name suggests, this type of pasteurization does not require water; the heating elements in the device provide the temperature. But how do you go about dry pasteurization to ensure the preserves are well preserved?

To be well prepared for dry pasteurization, a few details need attention. First—only twist-off jars, the classic ones with a screw cap, are suitable for pasteurization in the oven. Any container with flexible rubber or rubber seals may not be suitable for such high temperatures. Secondly, jars cannot be damaged or even scratched. This is obvious to anyone who makes preserves at home. However, special attention should be paid before dry pasteurization in the oven. It is also worth remembering not to fill the jars with preserves to the very top. Leave about 1 inch of free space.

1. Place the prepared and tightened (you don't have to tighten the jars very much for dry pasteurization) with preserves on a baking sheet lined with parchment paper or cloth. Arrange the jars so they do not touch each other or the oven's walls. Importantly, place the jars with the lids facing up.
2. The next important issue is the pasteurization temperature. With dry pasteurization in the oven, the same method applies to classic pasteurization in a pot. So, pasteurize cold preserves starting from cold water or in a cold oven, and hot ones from hot water and in a preheated oven.
3. If you put preserves in a hot oven, preheat the device to 250°F (no convection). If you pasteurize cold preserves, put the baking sheet in the oven, then set the oven to the same temperature.
4. How do you count the pasteurization time? In a preheated oven, it is simple: about half an hour from the moment you put the baking sheet with jars inside. However, if you pasteurize from a cold oven, count 30 minutes after the device heats up. Most modern ovens have a light that goes out when the device reaches the set temperature. The most modern ones inform about this on the display.
5. After the indicated time, leave the jars in the oven for 30 minutes with the door slightly open. When they cool down, tighten the lids securely and set the jars upside down for 24 hours. After this time, store the preserves in a cool, dark place.