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.
Jewish cuisine
Gefilte fish (from German "gefüllte" "stuffed" fish) was traditionally made by skinning the fish steaks, usually German carp, de-boning the flesh, mincing it and mixing with finely chopped browned onions (3:1), eggs, salt, pepper, and vegetable oil. The fish skin and head were then stuffed with the mixture and poached. The religious reason for a boneless fish dish for the Sabbath is the prohibition of separating bones from food while eating [the prohibition of 'borer', separating]
A more common commercially packaged product found today is the "Polish" gefilte fish patties or balls, similar to quenelles, where sugar is added to the broth, resulting in a slightly sweet taste. Strictly speaking they are the fish filling, rather than the complete filled fish. This method of serving evolved from the tradition of removing the stuffing from the skin, rather than portioning the entire fish into slices before serving.