We made 11 jars of pickled green tomatoes and 21 jars of salsa. Jars are Pint sized (≈.5 L). Unpictured is the 4 gallons (≈16L) of blanched and frozen red tomatoes that we'll eventually turn into sauce.
This took a while. Every window in the house was fogged.
It was close to 30 pounds, took up ≈75 square feet. Only planted 4 tomato plants
Wow that's impressive.
edit: I thought it was 15 lbs per plant, but it's really 7.5, which is still really good!
It's 7.5 lbs per plant, and no, I didn't do anything but weed, water, and mulch.
These are the end of year tomatoes that didn't have a chance to ripen on plant. If OP has a decently long growing season, they probably harvested a few multiples or that. For example, bandywine tomatoes weigh in at 1-2 pounds each and one plant will produce.. quite a few tomatoes.
Sauce: I grow tomatos in my garden too