Preheat your oven to 350°F (175°C). Melt dark chocolate and unsalted butter over a double boiler for 5-7 minutes until smooth. Remove from heat to cool slightly.

In a mixing bowl, whisk together sugar and eggs until pale and fluffy, about 3-5 minutes.

Gently fold the cooled chocolate mixture into the egg and sugar blend using a spatula, ensuring not to deflate the egg mixture.

Sift in the flour and gently fold until just combined without visible flour streaks.

Fold in the pistachio kadayif until evenly distributed throughout the batter.

Pour the brownie batter into a lined 9x9-inch baking dish and bake for 25-30 minutes.

Allow brownies to cool completely in the pan. Prepare chocolate ganache by heating cream and mixing with dark chocolate until glossy.

Once cooled, cut into squares and top with chocolate ganache and crushed pistachios.