A cake with a dark chocolate heart is a treat for all chocolate lovers. its soft core surprises and delights, revealing itself at the first bite, making it perhaps the king of sins of gluttony.
Soften the butter. Grease 6 small pans that can be placed both in the freezer and in the oven and dust with flour.
Mix the butter and sugar, add the eggs and, while continuing to mix, add the flour and sweetened cocoa powder slowly. Transfer the mixture into a pastry bag, fill the pans using a circular movement and place them in the freezer for at least 2 hours. Preheat the oven to 220°.
When the cakes are well chilled, bake them for 8-10 minutes at 220°. Serve lukewarm.