In a pan, add the milk and saffron and let it heat for a few minutes.
Once the milk is infused, take it off the heat and let it come to room temperature.
Preheat the oven to 180 degrees . Grease and line the sheet cake pan with parchment.
In a large bowl, add the butter and sugar. Using a paddle attachment fixed on a stand mixer or a hand mixer, cream the butter and sugar until light and fluffy.
Add and beat one egg at a time until completely incorporated.
Add the saffron infused milk and rose water into the mixture.
Sift the flour and baking powder into the wet mixture and mix for a couple of minutes until mixed thoroughly, scrape the sides of the bowl and mix well.
fold in the roasted chopped pistachios in the batter.
Pour the batter into the prepared pan and bake for about 45 minutes or until golden brown.