Melt the dark chocolate and butter over a double boiler or in the microwave. Let it cool slightly.
In a bowl, whisk together the all-purpose flour, almond flour, baking powder, vanilla sugar, and a pinch of salt to ensure the dry ingredients are evenly distributed.
In another bowl, whisk the eggs and granulated sugar until light and fluffy.
Add the melted chocolate and butter mixture to the egg mixture, and gently combine.
Gradually add the dry ingredients, then pour in the milk to create a smooth batter.
Preheat the grill to medium heat (about 350°F/180°C). Prepare a BBQ baking sheet with parchment paper or a heat-resistant baking dish.
Pour the batter into the prepared baking dish and sprinkle the top with sliced almonds.
Place the dish on the grill and bake covered for 20-25 minutes, or until the sponge cake is set and golden brown.
Check with a toothpick: if it comes out clean, it's done.
Let it cool for 10 minutes, then slice and serve, garnished with fresh fruit or extra chocolate sauce, if desired.
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