A type of cookie sold in bakeries. It gets its name from its frosting, which covers one of the cookie's faces. Half the frosting is black or brown (typically chocolate), and the other is white (typically buttercream or a firmer variation). The base cookie is moist but not really chewy, not too sweet, sometimes with a slight citrus flavor. I have never seen a packaged version of the black and white, probably because the cookie is also typically about 16cm (6 inches) in diameter.