You can make your own spice blends to add to your tomatoes, too. Make sure your canner and your jars and lids have been prepared before you start. Boil your metal lids to make sure they are sterile. You can always use plastic re-usable lids! Once you have processed the jars and they have cooled (after 24 hours) make sure the lids are sealed. Sealed lids will be concave and will show no movement when pressed. If still unsure if sealed, remove the band and grasp the edges of the lid and lift the jar.
If you have any unsealed jars, refrigerate immediately or reprocess. If you reprocess, you must use new lids.