Before adding tomato sauce to the jar add bottled lemon juice or citric acid to the jar. If using pint jars add 1 tbsp of bottled lemon juice or ¼ tsp of Citric Acid to the jar. If using quart ...
But making soup from scratch can be time-consuming, especially compared to the canned alternative. So, when I found this Ina Garten recipe for easy tomato ... in the leftover juice from each ...