This is a recipe for chocolate butter cookies that can be mass-produced, perfect for Valentine's Day. Mix unsalted butter with powdered sugar and cocoa powder, then add melted dark chocolate, cake flour, and almond flour to make the dough. Roll out the dough and chill until firm, then cut it into uniform 25mm squares and bake in a preheated oven at 180°C for 15-20 minutes. Decorate the baked cookies with melted coating chocolate, draw lines with white chocolate, and garnish with pistachios. These easy-to-make and cute cookies are perfect as a gift or for enjoying at home.