Since the beginning of winter, we have entered a critical period for the preservation of intangible cultural heritage cuisine - "Ailao braised and rotten". Entering Datianba Town, Changning County, Baoshan, Yunnan Province, a collaborative area between the east and west of Minhang, the fragrance of tofu permeates the streets and alleys. Every household takes advantage of the warm winter sun to pickle tofu, inheriting the century old skills and flavors.