Take all dry ingredients (all purpose flour, corn flour, baking powder, salt and sugar) in a bowl.

Mix well till incorporated.

Add chilled butter. And using your finger tips or fork incorporate butter and flour together. It will be crumbly texture.

Then add pistachios and lemon zest. Mix well.

Add 1 ½ tablespoons of milk. and make into dough.

Roll the dough into a log shape which is 1 ½ inches in diameter.

Roll the log in parchment pepper and keep in freezer for 20 minutes to chill.

Meanwhile preheat the oven to 350 degrees F or 180 degrees C. Line a baking sheet with parchment paper.

After log is firmed and chilled. Remove it from freezer. And slice it into ¼ inch thick slices using sharp knife.

Arrange them in prepared baking sheet. Arrange the cookies couple of inches apart because they will spread a little.

Bake them for 14 – 15 minutes or till you will see light brown around the edges.

Let it cool for 5 minutes in pan itself then remove it on cooling rack and let it cool completely.