The poutargue is synonymous with caviar in Martigues! 

It corresponds to the pouch of dried and salted mullet (or muge) eggs.

It is eaten as an aperitif or cooked, finely grated on pasta or with risotto. Its taste is unique.

You can find it on the local markets such as Thursday and Sunday in Martigues among others.
List on the site of the tourist office of Martigues.