I thought for sure that I had documented canning corn before. Unfortunately, I didn’t take photos during the preparation process and filling the jars. The process is pretty simple, though. You cut the kernels of corn from fresh corn cobbs and fill clean jars with the corn, leaving a 1″ head space. add 1/2 teaspoon salt per pint jar or 1 teaspoon salt per quart jar. (I use Kosher salt). From about 12-14 large pieces of corn, I got enough kernels to fill 8-pint jars. Next, fill the jars to the 1″ head space mark with boiling water. Pouring from a tea kettle makes it easy. Poke around and down the middle of the jars with a chopstick, skewer, or similar to remove air bubbles. Add more water, if needed. Wipe rims to make sure they are clean and top with prepared canning lids. Screw on rings until finger-tight.
Add the jars to the pressure canner, following manufacturer’s directions. I use a Presto brand 23 quart model.
For mine, after I secure the lid, I bring the water to a boil and a little piece pops up to let me know it’s ready. I set a timer for 10 minutes to purge the air out. At that point, I add the little weight that comes with the canner and allow the pressure to build to 11 pounds. The hardest part is regulating the temperature to maintain the pressure. If the pressure goes below 11 pounds, you have to raise the pressure back up and restart the time. I can relieve pressure if it goes to high, by pushing down on a little rubber button on the lid. For corn, the process time is 55 minutes for pints and 1 hour 25 minutes for quarts.
When the processing time is up, turn the heat off and remove the canner from the burner. (I do, because my burners are electric and do not quickly cool…you might not need to, if you use gas.) Allow the pressure to drop to zero, without forcing it. Carefully move jars to a kitchen towel, using a canning jar gripper tool.
When possible, tighten the screw rings well. (You might want to use a kitchen towel or two to avoid burns!) Allow the jars to set for 24 hours. Check seals to verify a good seal on each jar. If any did not seal, refrigerate and use within a couple of days. Sealed jars are stored in my pantry cabinet without the screw rings…I try to save them for Winter. We’ll see. Take advantage of those Summer vegetables while you “can”! Enjoy!
I used this website for reference: http://www.freshpreserving.com/recipes/whole-kernel-corn to make sure I was following safe procedures.