A friend pointed me toward the tree Moringa oleifera a few months ago. The more I learn, the more I like. It is very edible, prolific, will handle more arid conditions...
The seed oil is edible, can be used as a base for soaps, as a lubricant - and for biodiesel.
All this means is that I'm going to have to get several hand-cranked grinders... Although being able to convert a larger one to wind power would be useful - don't want to waste fuel making fuel. And I want to find a good, easy-to-make-under-bad-conditions catalyst for biodiesel - I'm sorry, but Sodium Methoxide isn't - I can find no evidence that it can be called a catalyst, rather than a reactant. One of the defining characteristics of a catalyst is that they don't get used up in the reaction.
If I can get some more growing from seeds, all good, but apparently, it will shoot easily from cuttings - which makes life so much easier. I did give myself a proverbial kick the other day, however. The obvious problem is fertisiling. Potassium and Sulfur may be a problem, although on decent soil, hopefully not too bad, but Nitrogen is a definite limiter. The obvious solution is to put a Nitrogen-fixing plant in there, and a perennial at that - but what? After not thinking about it for ages, I realised that a Carob tree (would be my third) would be the way to go... I would want to go the expensive route, and get one that could self pollinate, but that would be a nice solution.
It's just a pity, then, that my normal supplier is out of the the particular variety I want. I suppose I could wait a year (or whenever they are next available), or try to grow from seed if and when my two actually start to bear (could be a couple of years)...
Oh well, I will see if TEOTWAWKI or next planting season comes first, I suppose... *tongue firmly lodged in teeth*