In a bowl, mix peanut butter with sifted icing sugar (or powdered erythritol) into a pliable paste. Then, keep it in the fridge to harden.
Mix glutinous rice flour, icing sugar, and water in a pot.
Warm the mixture over low heat. When it starts to thicken, cook it for 5 minutes, stirring it vigorously, until you have a smooth and stretchy dough.
Transfer the mochi dough onto a worktop dusted with corn starch. Then, dust it with some starch to make it less sticky.
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{{/ items}} {{^ items}} {{/ items}}Pinch off a small handful of dough and shape it into a ball.
Flatten one ball into a thick disc and brush off excess starch on both sides.
Then, scoop a spoonful of cold peanut butter, roll it into a ball, and place it in the centre of the disc.
Pull the edges of the dough towards the centre and over the filling, pinching them together at the top.
Repeat for the other sides of the dough wrapper as you would do for a dumpling, pinching them at the top.
Then, hold the mochi in your hand and keep pinching the dough together while you twist the mochi to make a tight ball.
Finally, flip the mochi seam-side down and lightly press it into a dome shape.