Blend tomatoes, peppers, and onions at high speed for 5 seconds in electric blender. Boil gently 60 minutes, stirring frequently. Add vinegar, sugar, salt, and a spice bag containing dry mustard, red pepper, and other spices. Continue boiling and stirring until volume is reduced one-half and ketchup rounds up on a spoon with no separation of liquid and solids. Adjust lids and process jars as described in Table 2.
Tomatoes are an insignificant source of other vitamins.
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