Burning encrypted DVD

[Darknight]

I'd like to create DVDs that can be mounted and setup with dm-crypt without having to create a virtual volume on my hd and burn it as a file in dvd.
This would save one step (mount dvd, setup vs mount dvd, mount burned file, setup) good enough for me to give it a try.
I thought I could create an iso image (not sure how, honestly) mount+setup it and write in stuff until I'm ready to burn it. Then I would get an iso fs already encrypted on the optical support. Is this correct?
I suppose it's somewhat flawed since I'm a bit clueless