Grease a 9-inch round cake pan with butter & line with parchment paper.
Coarsely grind whole unsalted pistachios, should be around ¾th cup. Don't grind to a fine powder.
In a bowl combine all the dry ingredients, keep it aside.
To a large bowl, add butter & sugar; using an electric hand mixer beat at high speed till smooth & creamy.
You can also use a stand mixer with paddle attachment.
Separate the egg whites from 3 eggs, add that & beat well.
Add vanilla extract, beat for a few seconds.
Add yogurt or sour cream, beat for a minute.
Using a silicone spatula scrape down the sides of the bowl.
Add the saffron, beat well.
Add the dry ingredients, beat for 2 minutes.
Add milk & beat till well incorporated. Don't overbeat the batter.
Pour the cake batter onto the pan, smoothen the top.
Place in the preheated oven & bake for 35 to 40 minutes or till a fork inserted into the center of the cake comes out clean.
Run a knife through the sides of the cake to detach the cake from the pan, gently flip it over to a cake stand or platter.
Let cool down completely.
Making sugar-saffron syrup
In the meantime, let's make the simple sugar syrup.
Place a saucepan over medium heat, add the sugar, water & saffron.
Combine well & cook till sugar has completely dissolved in water.
Lower the heat & simmer for 3 minutes.
Take the saucepan out of the heat & let cool down completely. Can be kept in the refrigerator.
After the cake has cooled down, using a fork prick the cake.
Drizzle the cake with 3 tbsp of sugar-saffron syrup (don't pour the entire sugar syrup over the cake). Let rest for some time.
Slice the cake into 8 wedges.
Serve on a plate, if you need more sugar syrup drizzle a tbsp more on the cake slice.
Top with pistachios & enjoy.
The cake can be chilled in the refrigerator, tastes even more delish.
Leftover cake can be stored in the refrigerator for 5 days.
Notes
The recipe can be doubled for making a large cake or if you're layering the cake. Instead of sugar syrup, the cake can be frosted with cream cheese frosting.
Recipe by Cooking with Thas - Smart Cooking, Smart Living at https://thasneen.com/cooking/delicious-pistachio-saffron-cake-drizzled-with-sugar-syrup/