In a bowl combine butter, condensed milk and baking powder and stir well.
Add semolina and mix well combined.
Sprinkle chopped pista evenly in a baking tin.
Pour semolina mixture over pistachio and level it.
Bake in a preheated oven for 35 minutes or until top is golden.
Remove from oven and pour cooled syrup on top.
Place in fridge to completely cool then cut into diamond shapes and serve .
To prepare syrup
:- Place sugar and water in a saucepan, bring to boil and simmer for 6-8 minutes ,then remove from heat and stir in lemon juice and water.