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Grease a square pan (9” x9”).
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Melt the chocolate with the butter in a saucepan over low heat.
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Remove from heat and let cool.
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Preheat the oven to 350F.
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Whisk the flour, baking powder, and cocoa powder. Set aside.
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Beat the sugar, eggs, and 1 pinch of salt, and liqueur until creamy.
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Pour the melted chocolate into the dough in a thin stream.
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Beat in the dry ingredients until just combined.
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Fold in 3/4 of the chopped rhubarb.
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Transfer the batter to the prepared pan.
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Distribute the rest of the rhubarb and raspberries on top.
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Bake for 30 minutes.
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Remove from oven.