Chickens were first domesticated in Asia, perhaps as early as 3,200 BC. The historical record indicates chickens were known in ancient Egypt by 1,400 BC, and later in the Greek and Roman empires. When they first arrived in sub-Saharan Africa is unknown, but they are now common throughout Africa as in the rest of the world. A similar bird, the guinea fowl, is native to Africa and is widely raised there. Both are often called kuku in many African languages. Nsusu or soso are words for chicken in the Congo region. Every culture has its own way of cooking chicken: one of the classic methods of preparing chicken in Africa is to stew it in a peanut and tomato sauce (this basic recipe goes by many names in different parts of Africa). Another delicious African chicken dish is Poulet Yassa, which is chicken marinated in an onion-mustard mixture.