This is my Scottish grandmother's recipe. It melts in your mouth rather than be hard and crunchy like the North American version.
Sift cornstarch, sugar and flour together.
Blend in butter until combined and then use hands to knead into a soft dough.
Shape dough into a ball, cover with plastic wrap and refrigerate for 30 minutes.
Place dough in the bottom of a greased 9x9-inch pan and bake at 300°F for 15-20 minutes or until lightly browned.
Cool completely in pan and cut into squares.
Store in an airtight container.
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