This year's Mid-Autumn Festival falls on October 6, and mooncake season is in full swing! In Huairen City, Shanxi Province, the 1,000-year-old tradition of Tang Ganlu hollow mooncakes is thriving. The Chinese name Tang Ganlu comes from its sweetness and hollow, furnace-like shape. The pastries are famous for their crispy shell, sweet brown sugar filling, and unique hollow core – formed naturally during baking.