Yuanhuan Beef Soup. Red yeast beef only found at old shops. The owner says: 'Our red yeast is added with red yeast rice, which is considered a tonic. The flavor is also a special slightly sour and slightly sweet southern style.'. Red yeast beef only found at old shops. The owner says: 'Our red yeast is added with red yeast rice, which is considered a tonic. The flavor is also a special slightly sour and slightly sweet southern style.' Recommended specialty: Red Yeast Beef Soup. Address: 臺南市中西區府前路二段153號 Hours: 00:00–23:59 Tainan