Combine all ingredients in a large stockpot; bring to a boil, stirring frequently. Continue to boil, uncovered, 2 hours, stirring occasionally. Press tomato mixture through a sieve; return strained mixture to stockpot. Bring to a boil. Boil gently 2 hours, stirring occasionally.
Quickly ladle catsup into hot sterilized jars, leaving 1/4-inch head space. Cover with metal lids, and screw bands tight. Process catsup in boiling-water bath 20 minutes.