1In small saucepan, combine cloves, cinnamon sticks, celery seeds, and white vinegar. Cover; bring to boil. Remove from heat; let stand.
Wash, core, and quarter tomatoes into a large kettle. Add onion and cayenne pepper. Bring to a boil; cook 15 minutes, stirring occasionally. Put tomatoes through food mill or a coarse sieve.
Add sugar to tomato juice. Bring to boil; then simmer briskly 1 1/2 to 2 hours or until mixture is reduced by half.
Strain spiced vinegar mixture into tomato mixture; discard spices. Add salt. Simmer about 30 minutes or till desired consistency. Stir often.
Fill hot pint jars to within 1/2 inch of top; adjust lids. Process in boiling bath 5 minutes [ count time after water returns to boil] Makes two pints.