Mazurka with Chocolate

Preheat your oven to 180°C (350°F) and grease and lightly flour a rectangular baking pan. Line the base with parchment paper for easy removal.

Melt the chocolate and butter together in a heatproof bowl set over a pot of simmering water, stirring until smooth and fully combined. Remove from heat and allow the mixture to cool slightly.

In a large mixing bowl, beat the egg yolks with sugar until the mixture becomes pale and creamy. Gradually pour in the cooled chocolate-butter mixture, stirring continuously to combine.

Fold in the ground almonds and sifted flour into the chocolate-yolk mixture until a uniform, thick batter forms. Stir gently to avoid overworking the mixture.

In a separate clean bowl, whip the egg whites to stiff peaks using an electric mixer or hand whisk. The whites should hold their shape firmly when the whisk is lifted.

Gently fold the whipped egg whites into the chocolate-almond batter in two or three additions, using a spatula with slow, sweeping motions to preserve the airy volume.

Pour the batter evenly into the prepared baking pan and smooth the surface with a spatula. Bake in the preheated oven until the top is set and a toothpick inserted in the center comes out with only a few moist crumbs.

Remove the mazurka from the oven and allow it to cool completely in the pan before cutting into bars or squares. Serve at room temperature, optionally dusted with powdered sugar or drizzled with melted chocolate.