Updated with new list of names released by the Food and Environmental Hygiene Department on Thursday night
The Taiwanese company blended some of its lard with "gutter oil" - made from recycled food waste - and sold it as cooking oil.
About 70 per cent of the lard that bakeries used in Hong Kong came from Taiwan, according to an estimate by Simon Wong Ka-wo, chairman of the Chamber of Food and Beverage Industry. Chang Guann’s oil customers ranged from five-star hotels to traditional bakeries and Japanese noodle restaurants.
Hong Kong has since banned the sale of all products made with the firm’s oil.
The South China Morning Post has mapped the locations of Chang Guann's suspected customers in Hong Kong based on information provided by the Hong Kong Centre for Food Safety.
At the time of publication, companies on the list may have removed the tainted goods and may have stopped using the oil. Some of them contest the accuracy of the list, saying they have never bought oil from Chang Guann.
Notes: Many of the reported clients could only be identified by their Chinese names. Some locations could not be identified and some were only approximate. In case of ambiguities, readers should consult the original Food and Environmental Hygiene Department list.
Data curated by the Post is available for download here, including entries deleted from the original list.