This is the seed pod that will grow on the very top of a mature basil plant
Cut it, at the very spot where the sepals (small leaves at the bottom) stop growing
These are the 4 seed pods that I had gotten from that same plant
Carefully search the pods and remove the seeds without injuring them
Leave the seeds to dry for 1 week. Then they will be ready to plant.
I hope this guide has helped. Please comment or follow me. Thanks.