This dish is said to have originated in the 14th century, when supposedly all meat except for offal was shipped out of Porto to feed Portuguese troops in Africa, leaving Porto’s residents to make the most of tripe. It has since become one of the city’s most famous dishes. You will need to soak the beans overnight.This dish is said to have originated in the 14th century, when supposedly all meat except for offal was shipped out of Porto to feed Portuguese troops in Africa, leaving Porto’s residents to make the most of tripe. It has since become one of the city’s most famous dishes. You will need to soak the beans overnight.