If the dough is ready, it will hold the shape after poking it. Take the dough out and punch out the air.
Divide it into 4 equal pieces. Roll the divided dough into balls. Cover with plastic wrap, and let it rest for 15 minutes.
Take the mochi out from the fridge and sprinkle some glutinous rice flour on it to prevent stickiness. Divide it into 4 equal portions.
Place another plastic wrap on top of the mochi dough and roll it until flatten to an oval shape.
Take one dough out and roll it until flatten to an oval shape. Place the mochi on top. Please ensure that the mochi is slightly smaller than the dough.
Put the purple yam paste on top of the mochi. Roll the dough into an oval shape and seal it well.
Repeat step 23 for the remaining dough.
Place the dough in the oven with a cup of hot water. Let it rise for 15 minutes or until 1.5x its size. DO NOT turn on the oven.
Bring out the dough and sprinkle some flour on top. You can cut some slanted lines on the dough.
Preheat the oven to 180ºC or 356°F.
Bake the dough in the preheated oven for 20-25 minutes.
Make sure the dough is cooked through. And it will be ready to serve.