Meat is at a premium among the peoples of the Arab world,
so generally speaking every part of the animal is consumed.
This includes sheep testicles, which I tried in a
somewhat upscale Cairene restaurant once.
The texture reminded me of tongue, or perhaps kidney,
smooth and not at all stringy, although a bit gritty in parts.
The taste wasn't too remarkable, but neither was it
by any means unpleasant: underneath the peppery sauce
they tasted like meat, kidney being again perhaps the best
comparison point.
The most disturbing part was the
arrival of the order, since
the slices were arranged so that you could still
see the outline of the balls.
For the Western equivalent, see
Rocky Mountain Oysters.