Strawberry Freezer Jam” in the latest cooking demonstration video produced by the Oregon State University Extension Service Family and Community Health Program in Clackamas County. We follow the step-by-step instructions included in packages of pectin, which can be purchased at a grocery store, along with the jars for storing the jam. No strawberries? Substitute another fruit; blueberries, blackberries, marionberries, or raspberries, cherries, apricots, peaches or plums.