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Make the Sauce:
In a large pot, combine the tomato juice, tomato sauce, chopped onion, brown sugar, molasses, apple cider vinegar, allspice, ground mustard, salt, and black pepper. Simmer the sauce for 5 minutes, stirring occasionally.
Seal & Process the Jars:
Place the lids on the jars and screw on the rings until fingertip-tight. Process the jars in a pressure canner at 10 pounds of pressure for 90 minutes for quarts, or 75 minutes for pints.
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