Place butter in a small bowl. Place this small bowl in a larger bowl filled with hot water to melt the butter making sure no water gets into the bowl of butter.
In a separate large bowl, whisk eggs, icing sugar and salt.
Add flour and cocoa powder.
Add milk and continue whisking.
To enhance the chocolate flavor, add a teaspoon of coffee. This is optional though. You may skip this part if you don't want to have coffee in your cake.
Add melted butter into the batter.
If you don't have a crepe maker, you can use a non-stick pan to make this. Heat the pan before pouring a spoonful of batter and spread it into a thin layer.
Preheat the crepe maker. Strain the batter. Dip crepe maker into the batter.
It takes close to a minute for the crepe to cook.
Once the crepe is cooked, loosen the edges before tipping it out onto a plate.
Repeat until all batter is used up.
To prepare the filling, whisk whipping cream until fluffy. Add sugar.