01 -
Line a sheet pan with parchment paper. Use a small ice cream scoop to scoop tightly packed ice cream balls. Place them on the parchment paper with a flat edge so they sit flat on the sheet. Freeze for 1 hour.
02 -
Combine glutinous rice flour, sugar, and powdered sugar in a microwave-safe bowl. Add water and mix until smooth. Cover the bowl with plastic wrap and microwave for 1 minute. Wet a spatula to prevent sticking and fold the dough repeatedly. Cover and microwave again for 1 minute, then fold again. Microwave for an additional 30 seconds. If the dough is not shiny, microwave for another 30 seconds.
03 -
Dust a piece of parchment paper with cornstarch and transfer the hot mochi dough onto it. Dust the dough with more cornstarch and roll it into a large rectangle with a thickness of 1/4 inch. If sticking occurs, lightly dust with cornstarch. Place the rolled dough on a sheet pan and refrigerate for 30 minutes.
04 -
Cut large squares of plastic wrap, one for each ice cream ball. Each mochi will be wrapped in plastic wrap after filling.
05 -
Use a 3-inch round cookie or biscuit cutter to cut circles in the chilled dough. Brush excess cornstarch from the dough circles. Take one circle and place an ice cream scoop in the center. Gently press the dough around the ice cream and pinch the edges to seal. Place the wrapped mochi on plastic wrap and twist the corners tightly to secure.
06 -
Place wrapped mochi back in the freezer with the twisted side down. Repeat with the remaining dough and ice cream. Freeze for at least 1 hour before eating. Store mochi ice cream in a freezer-safe bag or container for up to 3 months. Thaw slightly before eating.