Workers sort out duck eggs to make salt preserved eggs at Foshoushan Food Co., Ltd. in Guang'an, Southwest China's Sichuan province, Sept 10, 2017. Salt preserved eggs, a kind of traditional food of Guang'an city, is made of duck eggs boiled and steamed with dozens of condiments. Guang'an city has made the traditional food as a scaled industry by encouraging food companies to diversify their products and promoting sale on the internet.[Photo/Xinhua]

Photo taken on Sept 10, 2017 shows a tray of sliced salt preserved eggs at Foshoushan Food Co., Ltd. in Guang'an, Southwest China's Sichuan province, Sept 10, 2017. Salt preserved eggs, a kind of traditional food of Guang'an city, is made of duck eggs boiled and steamed with dozens of condiments. Guang'an city has made the traditional food as a scaled industry by encouraging food companies to diversify their products and promoting sale on the internet.[Photo/Xinhua]

Salespeople update the content of its online store at Foshoushan Food Co., Ltd. in Guang'an, Southwest China's Sichuan province, Sept 10, 2017. Salt preserved eggs, a kind of traditional food of Guang'an city, is made of duck eggs boiled and steamed with dozens of condiments. Guang'an city has made the traditional food as a scaled industry by encouraging food companies to diversify their products and promoting sale on the internet.[Photo/Xinhua]

A worker picks up finished salt preserved eggs at Foshoushan Food Co., Ltd. in Guang'an, in Guang'an, Southwest China's Sichuan province, Sept 10, 2017. Salt preserved eggs, a kind of traditional food of Guang'an city, is made of duck eggs boiled and steamed with dozens of condiments. Guang'an city has made the traditional food as a scaled industry by encouraging food companies to diversify their products and promoting sale on the internet.[Photo/Xinhua]