What is this vegetable/fruit?

This thing is just sitting next to our office fruit bowl and I've never seen anything like it before and I have no idea where it came from 😂

Everyone just shrugs at me when I ask. There were two and now there's one so someone must have eaten the other. I'm so curious you eat it though? What does it taste like? I really want to try it but I don't want to waste it in case I don't like it. Any suggestions.

I'm in Germany and quite new so I'm not sure if that means anything, maybe it's a native plant lol