What is the red color in the rectangular center of childhood cakes?

Orange cake. Many people have eaten a special pastry snack with soft outside and red inside when they were young. This snack is called orange cake, which is a traditional cake in Zhejiang. It is handmade, small and lovely, soft and elastic, but soft and sticky. Orange cake originated from Anhai Town, Quanzhou City, Fujian Province, and is popular in southern Fujian and Jiangsu and Zhejiang provinces of China. It is a famous snack in Minnan, China. This snack is made of glutinous rice in the south of the Yangtze River. Exquisite appearance, jade-like quality, smooth and delicious, moderate sweetness and toughness, rose and orange fragrance, rich taste, waxy but not sticky, sweet but not greasy, suitable for all ages. Deeply loved by the public.