Ethiopian cuisine
Both Ethiopian Orthodox Christians and Muslims avoid eating pork or shellfish, for religious reasons. Pork is considered to be unclean in both Ethiopian Orthodox Christianity and Islam. Many Ethiopians would abstain from eating certain meats, and would mostly eat vegetarian and vegan foods.
Portuguese cuisine
Alentejo is a vast agricultural province with only one sizeable fishing port, Sines; and in the past, shellfish would not have been available in the inland areas. On the other hand, all points in the Algarve are relatively close to the coast and pigs used to be fed with fish, so clams were added to the fried pork to disguise the fishy taste of the meat. Nowadays, however, nobody would dream of calling it "carne de porco à Algarvia". Legend also says that the dish was developed to test Jewish converts' new Christian faith; consisting of pork and shellfish (two non-kosher items), "Marranos" were expected to eat the dish in public in order to prove their complete detachment from the Jewish faith.