Heat the butter on a skillet and cook until it bubbles and almost starts to brown. Add in the cookies and continue to cook until the butter browns and it all smells sweet and nutty. Set aside to cool.
Make the coffee as normal. Add in the ice and syrups.
Add the heavy cream, milk, vanilla syrup and pistachio syrup into a container and use a hand frother to froth up the milk.
Pour the cold foam over the coffee and top with the cookies.