Michigan State University Extension
Preserving Food Safely - 01600831
Quantity and Selection: Select only disease-free, vine-ripened, firm fruit for canning.
CAUTION: Do not can tomatoes from dead or frost-killed vines.
Quantity: FOR THIN SAUCE -- An average of 35 pounds is needed per canner load of 7 quarts; an average of 21 pounds is needed per canner load of 9 pints. A bushel weighs 53 pounds and yields 10 to 12 quarts of sauce - average of 5 pounds per quart. FOR THICK SAUCE - An average of 46 pounds is needed per canner load of 7 quarts; an average of 28 pounds is need per canner load of 9 pints. A bushel weighs 53 pounds and yields 7 to 9 quarts of sauce - an average of 6 1/2 pounds per quart.
Procedure: Wash, remove stems and trim off bruised or discolored portions. TO PREVENT JUICE FROM SEPARATING, quickly cut about 1 pound of fruit into quarters and put directly into saucepan. Heat immediately to boiling while crushing. Continue to slowly add and crush freshly cut tomato quarters to the boiling mixture. Make sure the mixture boils constantly and vigorously while you add the remaining tomatoes. Simmer 5 minutes after you add all pieces.
IF YOU ARE NOT CONCERNED ABOUT JUICE SEPARATION, simply slice or quarter tomatoes into a large saucepan. Crush, heat and simmer for 5 minutes before juicing.
Press heated juice through a sieve or food mill to remove skins and seeds. Simmer in large-diameter saucepan until sauce reaches desired consistency. Boil until volume is reduced by about one-third for thin sauce, or by one-half for thick sauce. ADD BOTTLED LEMON JUICE OR CITRIC ACID TO JARS. To ensure acidity, add two tablespoons of bottled lemon juice or 1/2 teaspoon of citric acid per quart of tomatoes. For pints, use one tablespoon bottled lemon juice or 1/4 teaspoon citric acid. Add sugar to offset acid taste, if desired.
Fill hot jars, leaving 1/4-inch headspace. Adjust lids and process.
RECOMMENDED PROCESS TIMES FOR STANDARD TOMATO SAUCE IN A BOILING-WATER CANNER
Process Times at Altitudes of Style of Jar 0- 1001- 3001- Above Pack Size 1000 ft. 3000 ft. 6000 ft. 6000 ft.
Hot Pints 35 min. 40 min. 45 min. 50 min. Hot Quarts 40 45 50 55