I’m normally squeamish, but did develop a serious taste for Irish Black Pudding, a sausage made from beef blood. Fabulous and addictive with fried eggs.
That is served at every B&B my wife and I stayed at while vacationing in Ireland and Scotland. On my wife's advice (she grew up in Britain), I avoided trying the stuff. I'd rather try beans on toast. I do like mushy peas however.