Located in the heart of the capital (OSU: Re), where one can find a number of hang-outs for both ex pats and Ghanaians alike, this is not a place where one does, receives, or views any "chopping".
In the local parlance, "chop" means "eat", so a "chop bar" is a place where you go to eat--and not necessarily a bar, even;-)
If ever you find yourself in Ghana, and specifically OSU, ask for it. The prices are reasonable, and you can find a wide variety of food there.
Good weekend!
