Been a while since I did one of these. Will post the solution Saturday. Meanwhile, any guesses?
OK it’s Saturday here’s the solution: it’s a canning strainer. You cut up fruit into strainer, use the pestle to force fruit pulp out into a bowl under strainer. Great for making applesauce, jellies, jam, pie filling, etc. Be sure to pick one of these up before the apocalypse.
Click pic to embiggen.