To prepare a chinese steamed buns with barbecued pork filling recipe, first you need to prepare your ingredients. First, you'll need 2 cups of water and 2 tablespoons of lukewarm water. Then, add 1 tablespoon of cornstarch and 1 teaspoon of sugar to the water, and stir until the sugar dissolves. Next, pour the boiling water into the dry ingredients and mix until they're completely combined. Now, take the wet ingredients out of the bowl and put them in the flour and water mixture. Stir the mixture until it's completely incorporated, then add the pork and cook it over medium heat, stirring occasionally, for 5 to 10 minutes. After 5 minutes, remove it from the heat and let it rest for 10 to 15 minutes before serving.