Yeah, at the end of last summer, I had a whole pile of excess tomatoes from the garden that I wouldn't be able to eat before they went off, so I bunged them in

Yeah, at the end of last summer, I had a whole pile of excess tomatoes from the garden that I wouldn't be able to eat before they went off, so I bunged them in a very large saucepan and simmered them until they took up 1/3 the volume, and put them in hot jars. It's a fairly common way to preserve them.