Potatoes exploding all over the inside of a microwave is a fist clencher, especially when it is your tea and you have nothing else.
I was gonna say, if like the OP said, it was 6 flat surfaces, you'd have a microwave. But somehow, that's still a pain-in-the-ass to clean.
And why the hell do cut potatoes still explode anyway? I've nuked whole potatoes and they didn't explode.
I guess the moral is, if there's a mess, clean it before it gets re-baked a dozen times.