Bulletin #4085, Let’s Preserve: Tomatoes (PDF) Developed by Penn State Cooperative Extension with special project funds from Extension Service, U.S. Department of Agriculture. For information about UMaine Extension programs and resources, visit extension.umaine.edu.Find more of our publications and books at extension.umaine.edu/publications/. Table of Contents Recommended Varieties Quality Quantity Acidification Freezing Canning Procedure Process Times Tomato