You should watch it again. Great acting! That movie and Driving Miss Daisy are two of my favorites. Jessica Tandy is in both of them. She nails her characters!
I’ve never had a ripe green tomato that I know of, just the early red ones before they change color. As soon as they start to turn, they aren’t the same.
(Brave aggregator gives this info: "Tomatoes stop producing lutein when temperatures reach 85°F to 90°F. At these high temperatures, the plants do not produce lycopene and carotene, which are responsible for the ripe tomato color, and this likely affects the production of other carotenoids like lutein. Additionally, high night temperatures above 70°F can interfere with the ripening process and the formation of red coloration in tomatoes."