Pour water into a wok or deep frying pan until it is one-third full. Bring to the boil over high heat. Line a bamboo steamer with baking paper and place over wok (make sure it doesn't touch water). Place 5 buns into steamer. Cover with steamer lid. Cook for 15 minutes, or until a skewer inserted into centre comes out clean. Keep warm. Repeat with remaining buns. Serve.