One should never be taken in by any fast food outlet advertising their products photographically. Most, if not all, of these photographs have been produced by a team of specialists - food stylists, art directors, photographers, props experts, assistants, etc, etc, etc. In fact, many of the products photographed are not edible, such is the length of time it takes to set up and produce the 'shots'. Take the humble burger; meat is superficially cooked, tinged with a colourant and browned with a torch, only the tomato rind is used to avoid any juices spoiling the shot, the contents of the burger are held together with toothpicks to avoid sagging of the bun. The edges of melted cheese are often been brushed with domestic cleaner to make them look 'melted' longer. Bon appetit!