Have you tried the standard recipe? If so what about it didn't appeal or can't be adjusted?

NCHFP - Ketchup

The Heinz copy-cat recipe is nothing but tomato paste, onion powder, garlic powder, a little sugar and salt, vinegar and water, and corn syrup plus citric acid and preservatives. But it isn't tested for canning safety with corn syrup.

So I suppose you could use the NCHFP recipe and leave out the cinnamon, cloves, allspice, and celery seeds and you'd be very close.

Dave

How long can ketchup last in the refrigerator without canning? I would love to make some this year, if it will last...

The guidelines say 3 months. Or you can freeze it for longer storage.

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Thank you Dave, for your helpful advice and for the NCHFP link.

Lola

Jeffrey Steingarten (food writer and food critic for Vogue magazine) wrote a terrific (and funny) book called "The Man Who Ate Everything" in which he rated all the ketchups as compared to Heinz (the gold standard - according to him, and me), and then developed his own homemade ketchup recipe. He claims it's very close to Heinz's flavor.