In a bowl, combine glutinous rice flour, corn starch, sugar, and water. Mix well until there are no lumps.
Add vegetable oil and mix thoroughly.
Incorporate food coloring, adjusting to your preferred shade. Note that the color will darken after steaming.
Steam the mixture over high heat for 15-20 minutes, or until a fork inserted into the mixture comes out clean.
Remove the bowl from the heat and let it cool slightly. To speed up cooling, place it in the freezer for about 5 minutes or until lukewarm.
Once cooled, knead the rice cake dough for 5-10 minutes until smooth and stretchy. Use gloves to avoid stickiness.
Wrap the rice cake in plastic wrap and refrigerate for 10 minutes.
Whipping Cream Filling
In a bowl, combine whipping cream and sugar. Whisk until stiff peaks form.
Transfer the whipped cream to a piping bag and set aside.
Korean Persimmon Filling
Peel the persimmons and cut them into quarters. Carefully remove the seeds while maintaining the persimmons' shape.
Cut the quarters into cubes. Enjoy any small leftover pieces.
To Assemble
Wearing gloves, divide the Korean rice cake into 4 equal pieces, approximately 45g each.
Dust a rolling pin and surface with corn starch or cooked glutinous rice flour. Flatten each piece of rice cake until it's large enough to cover the filling.
Pipe whipped cream into the center of each flattened dough piece and place a persimmon cube on top. Wrap the dough around the filling to enclose it.
Place each Chapssaltteok seam-side down on a plate dusted with corn starch. Repeat the process with the remaining ingredients. Serve and enjoy.
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