Martha Zepp, Penn State University
One of the most common mistakes is confusing how the food is put into the jar and the method of processing. This centers around the word “cold pack,” a term that is no longer used in modern canning books. To some people cold pack means to put the food into the jar raw without first cooking it—in other words, the food is cold. To other people, cold pack means that the jars are processed in a boiling water bath. Instead of “cold pack” modern research based directions give instructions for putting food into the jars raw or cooked.