Flour parchment generously with corn starch and roll out the mochi dough on the parchment. This is a very sticky dough so flour the mochi dough too, and as required.
Roll out the mochi dough into a ~ large rectangle. Slide the rolled out mochi sheet onto a tray and refrigerate for 10 minutes to allow it to firm up.
Once it is chilled, the mochi dough (still soft) will be firm enough to work with. Using a round 8cm cutter, cut out as many rounds as possible in the mochi dough.
Gently pick up one cutout mochi dough and brush off excess flour on each side with a pastry brush. Then, heap 1 tsp of azuki bean filling in the centre of the mochi dough and gently seal the seams close.
Place the sealed mochi seam side down unto the work table, turning it gently and shaping it rounder with your fingers until the mochi is nice, round and plump.
Brush off any excess flour and the mochi is done. Repeat with the other cutouts.
Do not waste the mochi dough scraps. Gently dust off all excess flour from the dough scraps, combine into a ball and re-roll to make more mochis.
Once assembled, store the mochis sealed in an airtight container at room temperature to prevent drying out. The mochis is most delicious, eaten fresh on the day itself or within 2 days. (Note: *do not refrigerate* or the mochi skin will turn hard)