"Cereus-validus" expounded:

You will need to cut open the fruit and carefully remove the seeds.

It will be a tricky matter removing the seeds from the pulp and drying them
but may be worth it if you can grow plants from them whith the traits you
suggest.

I watched a show recently about a woman in Maine who saves heirloom
tomato seeds. What she does is squeezes the seeds out into canning
jars, then fills the jars with water and covers them with cheesecloth.
She lets it sit for a week or so, there's a disgusting mold that grows
on top; the fermentation cleans the pulp off the seeds. The good
seeds drop down to the bottom. She spoons the yuck off the top and
pours the seeds out onto cheesecloth and then rinses them and lets
them dry. Never tried it myself. YMMV.

--
Ann, Gardening in zone 6a
Just south of Boston, MA
********************************