Cut the tops off the tomatoes and cut in half, place into enamel pot. Inspect and remove any bad spots/tomatoes.
Add the onions, oregano, garlic, sugar, pepper and bay leaves. Stir and place on stop on medium heat.
Stir to keep from burning in the pot for 1 1/2 hours, until thick. Tomatoes will begin to break down and reduce.
Prepare the food mill station to receive the tomatoes.
Remove from heat and process in the food mill.
Wash out the enamel pan, and place the juice back into the pan.
Add the red wine vinegar and salt into the mix.
Put back on the stove for 45 minutes to an hour, to reduce further (less water = thicker sauce).
Remove from heat and ladle into the jars, leaving 1/2" head space.
Place seals and bands on the jars and hand tighten.
Process the jars for 35 minutes in water bath canner for pints 40 minutes for quarts (adjust for elevation).
Video
Notes
Reduce reduction time by letting the tomatoes drain out extra juice in the fridge in a colander, if you have the space and time (we did not do this)
Start this early in the day, as the cooking time is 3 hours and processing is another 35-40 minutes per batch.
Makes about 14-15 pints or about 7 quarts
Taste as you go, you might decide you want to add more spices to your taste
The sauce is not super thick, like a paste. It will be between a soup and a paste consistency when done.
If you notice you have burned the tomatoes, do not attempt to scrap it while you have the sauce in there or it will go throughout the tomatoes and ruin the batch (it will all taste burnt). You should be able to use if you avoid scraping out the burn into the mix.