How to make
Melt the chocolate and butter in a bain-marie, or in the microwave. Beat the eggs with the sugar.
Gradually add the chocolate to the eggs and keep beating, until you achieve a homogeneous mix.
Spread the puff pastry on a tart tray. Cover with parchent paper and on top of it you can put beans or rice, so the pastry doesn't deform while baking.
Preheat the oven to 360°F (180 degrees) and bake the tart for 12 minutes. Cool it slightly and add the chocolate spread on top.
Add the chocolate-egg mix to the tart, as well. Bake for 18-20 minutes at 340°F (170 degrees) without fan.
Serve the tart cool dusted with cocoa powder and/or powdered sugar.
Enjoy!