jeebus wrote:I don't know if people have tried this already but a friend told me to save a cherry tomato, slice it up, place it in a pot full of compost, lightly cover and keep watered and in the sun. I did this two weeks ago and I now have seedlings starting to grow. Only time will tell if I get any yield of decent cherry tomatoes or not.
That is how tomatoes propagate in the "wild", that is to say, where people have thrown the rest of their cheese-and-tomato sandwich. Incredibly robust seeds, will survive composting, ingestion and defecation, sewage works, and still germinate.
You have two issues: one is that it is quite late to start toms now but you might get away with it. The other is that if the parent tomato was an F1 (i.e. crossed from two strains to produce a uniform characteristic) then it might not breed true. But you might get a wonderful new strain. Let us know how you get on.