In a large stockpot, add all ingredients and bring to a low simmer.
Whisk to get all ingredients combined and smooth.
Cook ketchup while canner comes to a rolling boil. Whisk every few minutes.
Clean and sterilize pint jars.
Place ketchup in pint jars with 1/2 inch headspace.
Wipe rims clean. Place lid and screw on band, only fingertip tight.
Place in water bath canner for 10 minutes.
Turn off heat and let them remain in canner for 10 more minutes.
Remove from canner, set on a towel and leave undisturbed for 24 hours. They seal pretty quickly, so after a few hours you'll notice which ones haven't sealed.
When ready to use, I place ketchup in a squeeze bottle for easy usage. Place in refrigerator and will last up to a month.