A week ago I bought 175 pounds of roma tomatoes from the Glanford Greenhouses for $75. I am sharing them 50/50 with my in laws.
On the day that I got them we processed about 2/3s of the tomatoes into raw pulp - I have this great food mill that very quickly grinds the tomatoes through. The pulp comes out one side and the skins and seeds go out the other. Pure tomato juice/pulp. 60 pounds yielded 5 gallons of pulp for me.
Today I processed that raw juice into a sauce, I reduced it by about half over the day and then made a sauce out of it with onions, celery, carrots and some salt. Very basic. I have 11 litres of tomato sauce from this. It is a very concentrated and sweet sauce.