The Hindus and Muslims of India do not, generally, eat pork, but Indian Christians do. This dish, with its semi-Portuguese name suggesting that the meat is cooked with wine (or vinegar) and garlic, is a contribution from the Konkani-speaking Christians of Western India.
Vindaloos, which may be made out of lamb and beef as well, are usually very, very hot. You can control this heat by putting in just as many red chillies as you think you can manage. Serve mounds of fluffy rice on the