If you find one with sufficient heartwood, shave the sapwood off and drill a hole through the middle, lenghtwise.
Otherwise it'll split and crack badly as it dries. Cutting a hole through it, allows it to loose diameter as it shrinks, otherwise the tangential shrinkage will crack it.
You'd probably need to coat the ends with glue, paint, wax or something like that, too.
And cut it maybe 4 inches too long, so I can cut the cracked ends off before turning it.
Lot of work for a set of grinders, eh?
It is not a true ebony, they come from the Diospyros family, same as persimmon or kaki.
I would guess, without actually checking up on it, that this is related to African Blackwood, which has somewhat similar properties as ebony.