1. Divide the mashed lotus seeds into a number of pieces; sieve and mix Tang flour and cornstarch well.
2. Bring sugar and water to boil, add Tang flour mixture to stir well, pour the new mixture onto the table top, add oil to knead well and divide the dough into a number of pieces.
3. Wrap a piece of mashed lotus seeds in a piece of dough, knead the dough round, put them in cake moulds applied with oil, press them hard and tip them out.
4. Put the cake in the steamer applied with oil and steam them for 10 to 15 minutes until cooked for serving.