Edible Organs

What organs have you eaten? A recent family reunion brought me face-to-face with an old tradition I must confess I am not too fond of -- kidney stew. It did make me think about which innards get eaten and which ones don't. You've heard of brain tacos and spleen stew, right? Why is it we've all heard of people eating tripe (beef intestines)  but you never really hear about people eating lungs? And if given a choice, wouldn't you go for something filled with air instead of poop? How about pork uterus? Or eating one's own placenta? I suppose something like haggis or a hot dog just gives it to you all at once, no questions asked. ***Photo by peephole via Flickr.***