 The Han Chinese rebel Wang Su who received asylum in the Xianbei Northern Wei after fleeing from Southern Qi, at first could not stand eating dairy products like goat's milk and meat like mutton and had to consume tea and fish instead, but after a few years he was able to eat yogurt and lamb, and the Xianbei Emperor asked him which of the foods of China (Zhongguo) he preferred, fish vs mutton and tea vs yogurt.The great migration of Chinese people south during the invasions preceding and during the Song dynasty increased the relative importance of southern Chinese staples such as rice and congee.Su Dongpo has improved the red braised pork as Dongpo pork.