I've got jarred tomatoes, so that bit is sorted. As to the cans themselves -- I'm a special special snowflake, and react (unpleasantly messily) to something in the lining of cans. Less of an issue now that many cans have plastic lining, but I don't know which ones I'm going to react to unless I try them, and I get food reactions often enough without that to not actually want to risk it.