The French eat more offal than many other nationalities. In the Netherlands, I sometimes ate liver or blood sausage but that was about it. In France, I discovered sweetbread, kidney and spleen but I have not yet dared to eat heart or lungs.
A French editor once tested my willingness to adapt to France and the French way of life by ordering me a plate of slightly cooked kidneys with lasagne. The dish looked gross but I did acquire a taste for it.