Here’s something nobody tells you: you can taste test your canned tomatoes before you process them. Fill one jar, add the salt, stir it, and dip a clean spoon in. If it tastes like a salty ocean, back off. If it tastes like a slightly salted tomato, you’re golden. The salt won’t magically multiply during processing, so trust your tongue.
And for the love of all things plump and red, do not use rock salt meant for ice cream makers. I saw a Facebook mom group post about this, and I still can’t recover. Rock salt is not food-grade. It’s for making ice cream taste like winter, not for preserving your garden. Just don’t.
So there you have it: 1 teaspoon per quart, pure salt, add acid, don’t panic. Your tomatoes will be safe, firm, and ready to star in soups, sauces, or that weird spaghetti casserole you make every Thanksgiving. Now go forth, can, and remember: the only thing worse than salty tomatoes is a botulism outbreak. Happy canning, you glorious kitchen warrior.