My favorite way to can tomatos is to put 1/4 cup each of onion, bell pepper & 1/8 cup celery in bottom of pint jars & finish filling with tomatos, add a tsp of salt, seal & process in canner or water bath. That way you always have your tomato base mix for all those recipes that use onion, bell pepper & celery. I also do some jars with hot peppers in there and theres your salsa!! Easy & fast. I haven't ever tried freezing this but I guess it would work ok if you heated it through before freezing.