In your electric blender, add the buttermilk, vanilla, sugar, and food color. Mix well until it has a smooth, sweet, creamy green texture.
Then add ice cubes to crush it inside the mixture to make a thickened shake.
Add in a bit of water and milk to complete the ingredients.
Your perfect pistachio shake is ready. Refrigerate it for some time to cool it down so that it gains all the fresh flavor and texture.
The greenish color of this creamy shake is so appealing that one cannot wait to have it.
Serve your shake by showering the crushed pistachios at the top. Thus it will look a bit more enchanting.