I had seen Andouillette in French supermarkets. That variant looks nothing more than a fat sausage - with quite a well minced/blitzed filling.
I was aware before I ordered it that it was something offal. I just hadn't realised how offal. (I had it in a decent restaurant (in France) so I reckon it was a "good" one, possibly chef's own concoction.)
It looked nothing like the supermarket ones. The filling was very coarsely cut, with recognisably frilly, chewy bits, and I remember thinking at one point that "the best case scenario here is that this is tripe sausage". The smell was, err.... , farmyardy in the extreme.
Thank ${DEITY} for the really good tomatoes that were also on on the plate.