Prepare the Cake

In a heatproof bowl, melt the dark chocolate and unsalted butter together over a pot of simmering water, stirring until smooth. Remove from heat.

Melt Chocolate and Butter

In a separate bowl, whisk together the eggs and granulated sugar until pale and fluffy.

Gradually add the melted chocolate mixture to the egg mixture, stirring constantly. Add vanilla extract and mix well.

Sift in the all-purpose flour and fold gently until just combined.

Pour the batter into the prepared cake pan and bake for 25-30 minutes or until a toothpick comes out clean. Let it cool completely.

In a saucepan, heat the heavy cream until it begins to simmer. Remove from heat and add chopped dark chocolate. Stir until smooth and glossy.

Once the cake is cool, pour the ganache over the top, allowing it to drip down the sides. Refrigerate until set.