Pista Barfi

In a heavy based pan, place the milk over low heat.
Stir occasionally for 1 hour until the milk reduces its original volume by 1/6th.
Roast the pistachio nuts and cut them.
Mix the water & sugar. Heat them to make a thick syrup. Cover and keep aside.
Now, put the sugar syrup, roasted pistas, rose-water and green coloring to the reduced milk.
Stir until the mixture holds together without sticking to the pan.
Spread the mixture in a greased tray.
Allow it to stand for about 45 minutes to set, then cut into squares.