Prepare 3 types of filling. For the first filling, crumble the cookies, mix with chocolate-hazelnut paste and mold into balls with a strawberry in the center. For this filling, use half of all the berries. The second filling is the remaining half of the strawberries. For this, you will also need whole berries. The third filling is sliced kiwi.
Make the dough. Add sugar, rice flour and water to a bowl, mix until smooth and microwave for 3-5 minutes.
Prepare the cakes. Sprinkle a baking sheet, table, or other surface where you will place the finished mochi, with cornstarch. Take the dough and tear off a piece. You should get even pieces for each cake. Remember in your hands, forming a small flat cake, put the filling and fold the edges of the dough, forming a ball.