Marianne Martinez
Home canning has been a popular method of preserving food in the US since the late 1850s. The process involves filling clean jars with prepared food, sealing them, and then submerging them in boiling water. To load canning jars into a pan, first, place a round rack or kitchen rag at the bottom of a large, wide, non-reactive pot, such as an enameled Dutch oven, to ensure that water can circulate fully around the jars. Next, fill the pot and jars with water and bring it to a boil. While the water is heating up, prepare your recipe. Once the recipe is complete, carefully remove the jars from the canning pot and lay them out on a clean towel. Fill each jar with your product, leaving between 1/4 and 1/2 an inch of space at the top. Secure the lids and screw on the bands before carefully lowering the filled jars back into the canning pot.
| Characteristics | Values |
|---|---|
| Purpose of heating jars | To decrease chances of shattering due to temperature shock |
| How to heat jars | In a shallow pan of boiling water, mouth side down |
| How to prevent shattering | Avoid temperature shock by keeping jars warm before filling with hot liquid |
| Pot for canning | Large, wide, non-reactive pot like an enameled Dutch oven or a deep stockpot |
| Rack for canning pot | Round rack, kitchen rag, cake cooling rack, or extra bands tied together |
| How to load jars | Place the required number of jars on the rack in the pot, fill with water, and bring to a boil |
| How to fill jars | Remove jars from the pot, fill with product, leaving 1/4 to 1/2-inch headspace, and wipe rims before applying lids |
| How to process jars | Carefully lower filled jars into the canning pot, ensuring sufficient water coverage, and boil for a prescribed time |
| Post-processing | Remove jars from the pot and place upright on a towel for 12-24 hours, then inspect lids for seals |
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What You'll Learn
Sterilise jars in the oven
Sterilising jars is an important step in the canning process, especially if you don't have a dishwasher. Sterilisation helps to ensure your canned goods remain fresh and safe to consume. Here is a step-by-step guide to sterilising jars in the oven:
Firstly, wash your jars in hot, soapy water and rinse them thoroughly. This initial cleaning is important to remove any dirt, debris or residue from the jars before sterilisation. Place the jars on a baking sheet and put them in an oven preheated to 140C/120C fan/gas 1. The jars should be left in the oven for around 10 minutes to dry completely. This step ensures that any remaining water traces are evaporated, creating a sterile environment.
If you are using jars with rubber seals, it is important to note that dry heat can damage them. Thus, an alternative method is to boil the seals separately. Place the seals in a small saucepan, cover them with water, and boil for 2-3 minutes. This process effectively sterilises the seals without exposing them to dry heat.
After sterilising your jars and seals, you can begin the canning process. Fill the jars with your homemade preserves, such as jam or chutney, ensuring that the mixture is still hot when filling the jars. This helps to prevent temperature shock, which can sometimes cause glass jars to shatter. Pack the mixture well to remove any air bubbles, then screw on the lids tightly.
Finally, wrap each jar in newspaper and place them in a large saucepan. Cover the jars with water, bring it to a simmer, and let it simmer for about 20 minutes. Turn off the heat and allow the jars to cool completely in the pan. This final step helps ensure that your jars are fully sterilised and sealed, ready for long-term storage.
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Avoid thermal shock
Glass is sensitive to rapid temperature changes, which can cause it to crack or even explode. This phenomenon is called thermal shock. To avoid thermal shock, it is important to manage the temperature changes that your canning jars are exposed to. Here are some tips to avoid thermal shock when loading canning jars into a pan:
Firstly, always start with room-temperature jars. If you are using a water bath, place the jars in the bath early, allowing them to heat up gradually as the water heats up. This slow increase in temperature will help prevent thermal shock.
Secondly, avoid extreme temperature changes. Do not put very hot water into a frozen jar or place a hot jar into cold water. Instead, when removing hot jars from a canner, place them on a cloth-covered surface to prevent rapid heat loss. Similarly, do not rush the cooling process by moving jars into a cooler too quickly. Allow the jars to cool down gradually.
Thirdly, warm your jars before filling them with hot products. For example, if you are making a cake, let the batter come to room temperature before adding it to the jars. Warm water can also be used to cover ingredients like grains and beans.
Finally, be mindful of the environment in which you are canning. Do not attempt canning outside during cold weather, as the temperature difference could cause thermal shock.
By following these guidelines, you can help prevent thermal shock and keep your canning jars intact.
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Use a rack to load jars
To load canning jars in a pan, you'll need a rack designed for home preserving, or a cake cooling rack, or even extra bands tied together to cover the bottom of the pot. This will ensure the water can circulate fully around the jars. If you're using a rack, place the number of jars you need on top of it in your stockpot.
If you're using a dishwasher, you can put your jars in there to keep them warm before filling. Otherwise, you can place your jars in a pan of water on the stove, letting them come to temperature as the water does. Then, hold them there while you fill them one by one, so that only one jar is out of the water at a time. This will prevent temperature shock, which can cause the jars to crack.
If you're using a rack, load up the rack with handles, then lower it into the canning pot of boiling water. If you're not using a rack, carefully lower the filled jars into the canning pot. You may need to remove some water as you put the jars in the pot. A heatproof Pyrex measuring cup is a good tool for this.
Once the jars are in the pot, make sure they're fully immersed in the canning water by 1-2 inches. When the pot returns to a boil, start your timer. The length of processing time will vary depending on your recipe.
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Prepare the jars
Preparing canning jars is a crucial step in the canning process. Here is a step-by-step guide to help you prepare your jars effectively:
Firstly, select an appropriate vessel for your canning process. A large, wide, non-reactive pot like an enameled Dutch oven is a great option for cooking preserves. If you're making jams, jellies, or chutneys, a roomy Dutch oven is ideal. You can also use a deep stockpot as your canning pot. Place a round rack or kitchen rag at the bottom of the pot to ensure proper water circulation around the jars. Alternatively, use a cake cooling rack or tie extra bands together to cover the bottom of the pot. For smaller batches, a stainless steel skillet can also be used.
Before filling the jars, it is essential to sanitise them. While some sources suggest boiling the jars, this is not mandatory. Instead, you can wash the jars separately just before filling them, ensuring they are still warm. This helps prevent thermal shock and reduces the chances of shattering when filled with hot liquids. If you choose to boil the jars, place them upside down in a shallow pan of boiling water for around 20 minutes. This method is particularly useful if you don't have a dishwasher.
Once your jars are sanitised and warm, carefully fill each jar with your prepared product, leaving between 1/4 and 1/2 an inch of headspace, depending on the recipe. This headspace is the room between the surface of the product and the top of the jar. Ensure you don't overfill the jars, as this can lead to spillage during processing.
After filling the jars, use a clean, damp paper towel or the edge of a kitchen towel to wipe the rims. This step ensures that there is no residue or stickiness that could interfere with the seal. Now, apply the lids and screw the bands onto the jars securely. The bands help hold the lids in place during the processing stage.
By following these steps, you will have sanitised, prepared jars ready for the canning process. Remember to work with clean jars and always ensure that your jars are warm when filling to prevent thermal shock and potential shattering.
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Boil the jars
Boiling the jars is an important step in the canning process. It helps to sterilise the jars and reduce the chances of thermal shock, which can cause jars to crack or shatter. Here is a step-by-step guide to boiling your canning jars:
Firstly, choose a suitable pot for boiling your jars. A large, deep saucepot with a lid and a rack is ideal. Ensure the pot is large enough to fully immerse the jars in water by 1-2 inches. If you don't have a rack, you can use a cake cooling rack or a kitchen towel at the bottom of the pot to prevent the jars from rattling or breaking. You can also use a smaller pot if you are only canning a few jars.
Next, fill the pot with water and place the desired number of jars on the rack inside the pot. The water level should be high enough to completely cover the jars. Place a lid on the pot and bring the water to a boil. While the water is heating up, prepare your product for canning, such as making jam or chutney. You can also place the lids of the jars in a separate saucepan and bring them to a gentle simmer.
Once the water in the pot reaches a rolling boil, remove the jars carefully. Lay them out on a clean towel on your counter. Be cautious when handling the hot jars. Then, fill each jar with your prepared product, leaving between 1/4 and 1/2 an inch of headspace at the top. Wipe the rims of the jars with a clean, damp cloth.
After filling the jars, carefully lower them back into the boiling water in the pot. You may need to remove some water to make room for the jars. Ensure the water level is still high enough to cover the jars completely. Once the pot returns to a boil, start timing the processing time, which can vary depending on your recipe.
Finally, after the prescribed processing time, remove the jars from the canning pot and set them upright on a towel. Do not tighten the bands on the lids, as this may interfere with the sealing process. Allow the jars to cool undisturbed for 12 to 24 hours. Then, inspect the lids for proper sealing. If sealed correctly, the lids should be firmly attached and not flex when pressed.
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Frequently asked questions
To load canning jars in a pan, first, fill a large, deep saucepot with water and place a rack at the bottom of the pot. Then, place the number of jars you need on the rack and fill them with water. Bring the water to a boil. Once the water is boiling, carefully fill each jar with your product, leaving between 1/4 and 1/2 an inch of space at the top. Apply the lids and bands, then lower the filled jars back into the boiling water using a jar lifter and heatproof measuring cup to remove excess water.
To prevent canning jars from cracking, avoid subjecting them to rapid temperature changes. Instead of placing cold jars directly into hot water, allow them to come to temperature by placing them in the water as it heats up. You can also heat the jars upside down in a shallow pan of boiling water before packing to reduce the chance of thermal shock.
It is not necessary to sterilize canning jars before use, but sanitizing them can reduce the risk of breakage. To sanitize jars, wash them and place them in a canner filled with water. Warm the jars and water, but do not boil them.
