There is no law expressly stipulating that the food in one restaurant cannot be the same as other restaurants' practices, recipes, tastes, etc. And it can be done completely, not illegal at all.

Because dishes or recipes can't be patented, especially Chinese dishes are the crystallization of collective creation from ancient times to the present, and they are regional and popular, and are not patented by a company. So rest assured, it is in full compliance with the requirements of laws and regulations.