That’s an 8 quart pot. When I started the tomatoes were right to the lip of the pot after adding the onions, garlic and seasonings. The seasonings incidentally, for this pot full are as follows:
2 large yellow onions chopped coarsely,
5 large garlic cloves, peeled and chopped coarse,
1/3 cup of sugar,
1 tablespoon of seasoned salt, and 1/8 cup each of dried basil, oregano and marjoram
I simmer this in the rough until the onions are transparent then run the sauce thru a food processor on puree. Each processor batch is pressed thru a fine sieve with a rubber spatula into a large bowl. Or two very large ones in this batch’s case. When the last of the veggies are pureed I scrub out the pot and re-fill it with the puree, and using an anti-spatter screen cover the pot, I get the sauce back to a hearty simmer for an hour or so until the contents are about at the handle’s rivets as seen here. Then I add 1/3 cup of cold water with three very generous heaping tablespoonsful of corn starch, well shaken. The sauce gets to simmer another 15 minutes but has to be watched carefully and kept stirred well using a whisk. When I am ready to do the jars I turn the heat down to a mere simmer. I fill the jars while the sauce is slightly boiling and seal quick, then invert the jars on a towel on the table. They sit this way for 15 minutes, then get set right side up. Within a minute the lids snap down. That’s it. Let’m cool. I leave them on the table a couple days to be certain the lids take then store them in an absolute dark environment. Lids get the date and batch number with magic marker before going in the dark spot. Sure good eating come January.