Sift wheat starch flour and tapioca flour into a mixing bowl. Make a well in the centre. Melt salt in the boiling hot water. Stir boiling water into the flour and mix into a lumpy dough. Add shortening and knead dough until smooth. Form a cylindrical roll. Cut into 25 equal pieces.
NOTE: Tang meen fun is actually the normal wheat flour which has all its gluten (protein part) removed.