Preheat your oven to 350°F (180°C). Grease a 9-inch (22 cm) cake pan.
In a large bowl, crumble together the flour, butter, and baking powder. Add the sugar and one egg, then knead until a dough forms.
Divide the dough into three equal parts. Roll each part out to fit the size of the cake pan.
Place the first layer of dough into the prepared pan. Spread with apricot jam, then sprinkle with ground walnuts.
Repeat the layering with the second sheet of dough, then cover with the third sheet.
Bake the cake for 30-35 minutes, or until golden brown. Let it cool completely in the pan.
Melt the dark chocolate in a double boiler or microwave. Stir in the heavy cream until smooth.
Pour the chocolate glaze over the top and sides of the cooled cake. Let it set completely.
Refrigerate the cake for at least 1 hour before serving to allow the flavors to meld.
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