Mix refined flour,corn flour,salt and baking powder in a bowl and sift together.
In an another bowl mix sugar,butter and lemon rind ,beat and mix well.
Now mix the flour mixture in the butter mixture and mix together.
Add milk(add 1/2 tsp at a time)and make a smooth dough.
Make a roll /log from the prepared dough and keep it refrigerated for 20 minutes.
Take out the roll from the refrigerator and slice it to make medium size pieces.
Dip and gently press one side into crushed pistachios and arrange in a baking tray.
Bake in a preheated oven on 180 degree for 15-20 minutes or till golden in colour.
Take our from the oven and let them cool completely.
Store when cooled completely.