Mama Liu's Chinese Steamed Pork Buns 包子 (Bao Zi) Recipe.  6park.com
芹菜肉馅包子
Ingredients
 - 3 cups all-purpose flour
 - 2 tsp yeast
 - 1 tsp sugar
 - 1 cup warm water
 - 12 oz. ground pork
 - 6 or 8 oz. celery( other veg)
 - 1 tbsp chopped garlic
 - 1 tbsp chopped ginger
 - 1 tbsp chopped scallion
 - ½ cup chicken stock or water
 - 1 tsp salt
 - 1 tbsp soy sauce
 - 1 tbsp cooking wine
 - ¼ tsp white pepper
 - 1 tbsp oyster sauce
 - 1 tbsp sesame oil
 - 1 tbsp cooking oil 6park.com
Direction
 - To make the dough, mix 3 cups of all-purpose flour with 2 tsp yeast/ 1 tsp sugar/1cup warm water in bowl, and rest at warm place for 1 hr
 - Make the filling, mixthe ground pork with 1/2 cup chicken stock, add 1 tbsp chopped garlic/1 tbsp chopped ginger/1 tbsp chopped scallion /1 tsp salt/1 tbsp soy sauce/1 tbsp cooking wine/ ¼ tsp white pepper/ 1 tbsp oyster sauce/1 tbsp sesame oil. Then mix in 6-8 oz. chopped and dried celery. Ready to use. 
 - To make the bun, after one hour the dough will rise up about double size, knead the dough to the round shape, and divide to small pieces (about 25 pieces), use the rolling stick to make the wrap, and then each one by each one to make the buns
 - Rest the buns at the steamer or pan for about 15 minutes, and start to steam or fry, steam from cold water at high heat for about 15 minutes, fry from medium heat, add 1 or 2 tbsp oil at pan, after 5 to 8 minutes check the bottom of bun, if change to golden color, add 1/2 cup water in the pan, and cover until the water evaporates. Place in the plate, ready for serving.