I’ve read so many forums on this dang salsa recipe (it originated on the gardenweb forum) and to be honest, I’m not sure. There are a lot of people that say don’t deviate from the recipe for food safety and others say the tomato paste and tomato sauce can be optional because mostly you just want a mixture that sloshes around freely (if it’s too thick, apparently it can’t be heated through well enough to prevent bacteria from growing). My gut feeling says you are ok…but you’ll just want to use your best judgment.
I’ve never attempted to use canned tomatoes in the recipe, and can’t remember the last time I purchased store tomatoes, so I’m not sure how much liquid is in there in proportion to the fruit. My best guess to make this work would be to drain the tomatoes and then weigh them – but this would be a little high since the starting weight with raw tomatoes includes skins, seeds and excess juice that’s removed/drained off. Maybe around 16-80 pounds drained tomatoes? When I’ve drained my tomatoes after chopping, I end up with around 7 quarts in volume. There is no simple answer, unfortunately. If you give it a go, you may way to get pH strips to test the finished salsa and make sure the pH is below 4.6 for safe canning. If not, you could freeze, or add more vinegar.
I just made this wonderful salsa a couple of days ago with roma tomatoes. I 4X the recipe and ended up with 32 pints of salsa. We liked it so very much I am thinking of doing more with the 1 1/2 bushels of regular tomatoes that I have. Do you think that the regular tomatoes would have too much liquid in them or would the draining take care of that problem? I didn’t add the paste last time so I would probably add it for sure to make it thicker.