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cornstarch, sugar and rice flour together. If you don't have a sifter, try using a whip to mix/sift the dry ingredients. .
Sift Add butter Mix with hands until soft dough forms. Refrigerate one hour. Shape dough into 212 centimeter (1.0in) balls. Place about 3 centimeter (1.2in) apart on greased cookie sheet Flatten with lightly floured fork. Bake at 150C or 300F for 20-25 minutes or until edges are lightly browned.