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Prepare filling. In a bowl, combine all ingredients for the filling until well mixed. Set aside.
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Prepare sauce. Mix all ingredients in a bowl, making sure to dissolve the cornstarch in the liquid.
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To assemble. Place a sheet of bean curd sheet on a clean, flat surface. Spoon meat filling in the middle then fold the sheet over the filling. Fold the sides inwards and roll tightly, forming a 4-inch roll. Seal by brushing the edges with a little beaten egg white. Repeat procedure until all the filling is used up.
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Arrange rolls in a shallow plate and pour prepared sauce over them. Put the plate in the steamer and cook for 10-12 minutes or until done.