To prepare the steamed pork belly buns hoisin balsamic recipe, you'll first need to prepare your ingredients. In a large skillet, heat the oil over medium-high heat. Add the pork and cook, turning occasionally, until browned on all sides, about 5 minutes. Remove from the heat and set aside to cool. Meanwhile, in the bowl of an electric mixer fitted with the whisk attachment, beat the egg whites on medium speed until stiff peaks form. Gradually add the sugar, beating after each addition until the mixture reaches stiff peak stage. Pour the warm mixture into the dry ingredients and mix until just combined. Form the dough into 1-inch balls and flatten them with your hands. Flatten each ball into an 8-inch circle. Roll the balls out to 12 inch thickness and place them on ungreased baking sheet lined with parchment paper. Bake for 20 minutes or until golden brown. Serve warm or at room temperature.