What is China on the Tip of the Tongue about?

Food documentaries in China mainly focus on "the secret of the kitchen". Some are ingredients, such as Tricholoma matsutake and bamboo shoots, and some are special home-cooked dishes, such as home-cooked dishes with black pottery as the main tableware. Some are special kitchenware, such as steamer, and some are exquisite knives, such as bean curd silk and so on. Feast one's eyes