Pour the relish into the jars with airtight lids and store in the fridge for up to a month. I like to use these jars that I sterilize by boiling them in water for 10 minutes or running them through a hot dishwasher cycle. If you want to store it longer, consider canning the relish in sterilized jars. This will extend its shelf life for several months when kept in a cool, dark place.