You can use this recipe to can any amount. I sometimes do only 1 quart (if that's all the ripe tomatoes I have on hand). I have been making this recipe for almost 40 years and my Mother and Grandmother did it the same way for many, many years, and my Mother-in-law has been doing it this way for almost 70 years. While some folks advocate adding acids, I don't do this. I never have and never will put lemon juice in my tomatoes. I put a teaspoon of canning salt in each quart PERIOD. I have yet to lose a jar of tomatoes and nobody has ever gotten sick or died from them either. You can be assured that this recipe is tested, tried and true. [Editor's Note: recipe was updated to use cold pack method 6/27/03]