Just came across this, an article on food truck in Hong Kong and China.
(In Hong Kong) Some said they had invested HK$1 million (US$128,000) on their truck. By comparison, Wong (in Beijing) has spent about 500,000 yuan (US$75,500) on each of his five environmentally-friendly trucks.
“No alteration of the signature dish proposed by the applicant in the application form will be allowed after the submission of Application and throughout the Scheme,” it declares. “If the operator wishes to change dishes other than the signature dish, he should obtain prior written approval from the Venues and the Food and Environmental Hygiene Department.”