Went into the kitchen, played around a bit, and came up with a dish
from Southern Africa. "You mean South Africa?" No, Southern Africa,
as in the region.

This brings us to an unfortunate truth about the Web - the search
engines driving webpage design into irrational directions. To
classify African cooking by nation is not informative, because
those "nations" are defined by the lines of European colonialism, not
by ethnic / cultural divisions, and so the concept of "Angolan
cuisine" becomes questionable, because the concept of "Angolan
culture" is questionable. What is more sensible to speak of are
tribal and regional cultures, when speaking of the indigenous peoples.

The Southern reaches of Africa, like the Northern, tend to be arid,
and while I may be wrong, I'm guessing that one will see a large
nomadic element to the population as a result. I'll have to read more
on that, but one sees this in the northeast (or at least did until
recent times), because a nomadic lifestyle was an effective response
to the reality of devastating local droughts. Does the rain stop
falling in Ethiopia? Then migrate to Sudan or Southern Egypt, where
the vegetation still grows, and you can eat. Stay, and you starve.

Nomads become natural cultural middlemen, blurring cultural lines,
with the result that one finds difficulty when trying to say where
one culture leaves off and another begins. A common regional culture
arises, with local variation. When I start seeing dishes appear which
are common to the different countries of the region, but not to those
outside of it, I find myself wondering if I'm seeing one aspect of a
common, overlying regional culture.

But, we'll see. I have much more reading to do, as time allows.