To sterilize the filled jars with ketchup in boiling water, it will take about 15 minutes. This ensures a long shelf life at room temperature. Unsterilized ketchup will keep for three weeks in the refrigerator. You can also freeze the ketchup, without any sterilization.
Erratum: The recipe for Homemade Chunky Ketchup published in Volume 8, Number 7 is wrong. Please take the Web version of the recipe, where the vinegar was added. We are sincerely sorry.