Add 90g of white sugar into 50g of grated Yamaimo. Mix them well.

Put 1/3 of the Yamaimo Mixture into 1Tbsp of crushed sesame seeds.　Mix them.

Put the white Yamaimo mixture into 60g of "jouyo-ko (rice flour)".　Mix them. Put the rice flour into the yamaimo mixture. Take out the dough. (when around 2/3 of flour interblends into it.)

Put the sesame Yamaimo mixture into the rest of "jouyo-ko (rice flour)". Make the sesame dough little softer than the white dough.

Divide the each dough into 10, as using dusting flour.

[Make 10 Mushurooms]　Extend a white dough into a circle as using dusting flour.　Wrap a bean jam ball with the dough. (You don't have to wrap completely)　Make it egg shape.

Extend a sesame dough into a circle as using dusting flour. Make a smaller and thicker circle than white one.　Put it on the top.　Make 10 Mushrooms with this way.

Put them in a steamer. Spray Water over them.　Steam them for 9 minutes.　Take them out and cool them with a cotton clothes cover not to get dry.