Steps
1. Preheat the oven to 180°C (350°F). Grease and flour a small heart-shaped cake tin.
2. In a bowl, sift together flour, cocoa powder, and baking powder.
3. In another bowl, beat the egg and sugar until light and fluffy. Mix in the oil and milk.
4. Gradually fold the dry ingredients into the wet mixture until smooth.
5. Stir in the chopped pistachios.
6. Pour the batter into the prepared heart-shaped tin and bake for 20-25 minutes or until a skewer comes out clean.
7. Let the cake cool completely on a wire rack.
8. For the frosting, melt dark chocolate and butter together until smooth. Remove from heat and stir in powdered sugar.
9. Once the cake is cooled, spread the chocolate frosting evenly over the top.
10. Arrange fresh berries on top of the frosting.
11. Carefully place small gold leaf sheets on the berries and frosting for a luxurious touch.
12. Using an edible food marker or a small piping bag with melted white chocolate, write "Happy Mother's Day" on the surface or on a small edible plaque placed atop the cake.
13. Chill briefly to set the frosting before serving.