@Fallen Boy:
not sure if you are responding to the erowid recipe from post #2 or to post #4, but in the erowid recipe it says:
First, you need to prepare a "tea" from your cacti. If using dried cactus, powder it. If using fresh cactus, chop it to small pieces and then puree it in a blender.
Heed the warning from post #4: either blending or adding dry cactus powder to water yields a gel-like material that is quite tricky to reduce. The texture slows down normal drying which leaves enough time for it to rot, and heating it over a stove can very well cause it to burn. Which is something that happens when not enough free water is present to readily absorb the heat and boil off, and something I know from experience.
Drying, as with mushrooms, is a method for preservation. It enables you to store long-term without risk of rotting (as long as it is properly dehydrated). If you have fresh cactus, then if you want to prepare it for consumption drying may be a waste of energy like you seem to suggest; although it is mentioned it is this thread that A/B extraction from fresh cactus is messy (I doubt it is much easier if you dry first, I mean you wouldn't lose your fatty phase that way... right?).
If you are interested in straight up preparation then this subthread may be more appropriate for you:
http://www.bluelight.ru/vb/threads/...escaline-Dosage-amp-Methods-of-Administration
An alcoholic extraction I tried didn't give me the slime problem, but I was not motivated enough to proceed further from a crude extract. My Peruvian Torch cactus powder was of low potency anyway and later I found pure mescaline which was a huge relief.
I'm turning this into a B&D subthread.