A staff member shows Qingfeng steamed buns, transported by air from Beijing, at a restaurant in Hefei of east China's Anhui province on Mar. 10, 2014. According to the restaurant's manager, they ordered the first batch of 1,000 vacuum-packed buns from Beijing's Qingfeng restaurant and every customer can taste one for free. Qingfeng, which is best-known for its steamed buns, has its sales surge after Chinese President Xi Jinping dropped by for lunch at one of its branches on Dec. 28, 2013. [Photo: China News Service / Han Suyuan]

Customers taste Qingfeng steam buns, transported by air from Beijing, at a restaurant in Hefei of east China's Anhui province on Mar. 10, 2014. According to the restaurant's manager, they ordered the first batch of 1,000 vacuum-packed buns from Beijing's Qingfeng restaurant and every customer can taste one for free. Qingfeng, which is best-known for its steamed buns, has its sales surge after Chinese President Xi Jinping dropped by for lunch at one of its branches on Dec. 28, 2013. [Photo: China News Service / Han Suyuan]

A staff member shows Qingfeng steamed buns, transported by air from Beijing, at a restaurant in Hefei of east China's Anhui province on Mar. 10, 2014. According to the restaurant's manager, they ordered the first batch of 1,000 vacuum-packed buns from Beijing's Qingfeng restaurant and every customer can taste one for free. Qingfeng, which is best-known for its steamed buns, has its sales surge after Chinese President Xi Jinping dropped by for lunch at one of its branches on Dec. 28, 2013. [Photo: China News Service / Han Suyuan]