Beat the butter with the sugar. Add the eggs 1 by 1 while stirring.
Add 3.5 oz (100 g) of melted chocolate. Add the flour slowly. Put the mixture in a greased form.
Bake at 356°F (180 °C). When the cake is ready and cooled, add the remaining 2 oz (50 g) melted chocolate.
Decorate as desired.