As for the ass - I would definitely avoid "donkey meat" because it's too close to horse meat which has substantial negative connotation in anglo countries. Maybe specify which part it is (e.g. donkey shoulder stew) as in other dishes.
The frog club of open fire cooking restaurants
I bought the cookbook after reading the review and I can't imagine someone reading it and going "yes, these very simple recipes highly dependent on just the right ingredients and cooking method will surely work without them"