Well, you don’t know what goes in the commercial ones, do you?
From the box of A.D. from Lutz, Florida, by way of Pennsylvania in the 1940s, and originating in Ohio in the 1920s.
To 6 pints of tomatoes cooked, run through colander, add 3 pints sugar, 1 pint vinegar, 2 Tbsp. salt, 1 Tbsp. each of celery seed, mustard seed, cloves, pepper, allspice and chopped onions. Boil slowly for 1 hour. Put in bottles and seal.