I have a cast iron mortar and pestle, but only the interior is raw cast iron - the outside and part of the handle are enameled, and the majority of the handle is covered in some kind of hard rubber. Is there a way to season something like this, maybe at a lower temperature for a long period of time?
If not, what's the best way to care for this and keep it from rusting? If I just wipe it with oil after using it, it gets gunky pretty quickly.
Bonus question: any idea who made this? It has no brand identifier on it, and I bought it years ago.