A family doctor has raised food-safety concerns after domestic workers were spotted selling food they had prepared themselves on the roadside in Causeway Bay on Hong Kong Island.

Around six workers used an open area at an intersection of Great George Street under the Gloucester Road Flyover to process cooked ethnic food and sell it to people in Victoria Park, which is only 10 meters away, Ta Kung Pao reported.

The domestic workers were reportedly putting the food, including desserts, on the ground for further processing and packaging while vehicles drove past.

After processing, the workers would carry the food to the park and sell it to other domestic workers. They did this quietly, not calling out loudly but only walking around the groups sitting on the ground.

As their food items were cheap, at around HK$5 to HK$20 (US$0.64 to US$2.50) each, they were popular among their customers, with sales of about 20 bags of food per round.

There is warning signage in the park that hawking is prohibited, but this was ignored.

According to local laws, offenders could be prosecuted.

Family doctor Betty Kwan advised the workers to be aware of the food-safety issue as the food might be easily contaminated in such an environment.