Standard tomato sauce
From the USDA Complete Guide to Home Canning, 2009 edition
A bushel of tomatoes weighs a little more than 50 pounds and will produce 10-12 quarts of thin tomato sauce. The thicker you make your sauce, the lower the yield.
Wash, remove stems and trim off bruised or discolored portions from tomatoes.
Cut a good portion of the tomatoes into quarters and put directly into a large, hot saucepan and crush them with a potato masher.
Continue to slowly add and crush freshly cut tomato quarters to the mixture, stirring occasionally.
Simmer for another five minutes, then remove from heat and press the heated tomato mixture through a medium sieve or food mill to remove skins and seeds. Return to heat, simmer and reduce the sauce until you reach the desired consistency.
Add 2 tablespoons lemon juice to clean, hot quart-sized canning jars, adding salt if you like.
Fill hot jars, leaving 1/4-inch headspace.
Remove air bubbles by tapping jars lightly on the countertop and adjust headspace if needed.
Wipe rims of jars with a dampened clean paper towel. Adjust lids and process in a standard boiling water canner for 45 minutes.
Note: The recipe as printed in the USDA booklet includes variations for different canning techniques, altitudes, pressure cookers, and other details. We recommend that you purchase or download a copy of the guide to make sure the recipe you are using is appropriate for your choice of materials and techniques.
Heres the website where you can download the USDA booklet on canning: http://nchfp.uga.edu/publications/publications_usda.html