Black Africans do say that their fellow blacks taste better than Whites. Also, some early European explorers journeying up an African river encountered a native village where they found numerous blacks (prisoners of war and the like) staked out on wooden piles in the river. They were immersed in the water up to their necks and their legs were broken. Upon interrogating the local chief they discovered that this was the communal larder! It seems they were immersed in water as a means of tenderizing their flesh prior to consumption. The Europeans thought that the future dinners had their legs broken to prevent escape. They were corrected by the chief, who informed them that the pain inflicted on the poor beggars was done, not to prevent escape, but to improve the flavor of their flesh. The locals maintained that inflicting constant pain improved the taste.
This is probably so, as we know that severe pain and fear release enzymes into the bloodstream that certainly affect the flavor of the flesh. One wonders if any studies have been performed on Kosher butchery and death by slow exsanguation (loss of blood) and conscious terror on the part of the animals as they slowly bleed to death.
You won't find this sort of information in your favorite PBS or National Geographic "documentary" on Africa however. The above account appeared in an issue of Wilmot Robertson's (now defunct) magazine Instauration, but I don't recall which issue. This was at least 12 or 15 years ago. The article did provide details of source, date and location.