A canning jar is a type of jar used for storing and preserving food, such as fruits, vegetables, and jams. It has a tight lid that preserves the food inside, keeping it fresh for a long time. Full definition
And she's right — it's not scary when you're actually doing it, and once you've cracked open your own canned jars you'll think nothing of it. (farmfreshfeasts.com)
You can use canning jars with lids, or even recycled jam or spaghetti sauce jars. (inerikaskitchen.com)
About ten minutes before the ketchup is done, put the lids of canning jars in small pot with water and heat it gently on the stove for 5 minutes. (strawberriesforsupper.com)