Preparation:
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In a saucepan, heat the orange juice just until it’s about to boil (but don’t let it boil).
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Remove from heat and add the chocolate and butter. Let them melt together and stir until smooth. Set aside.
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In a separate bowl, beat the eggs and add the cream.
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Grate the orange zest and add it to the egg and cream mixture.
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In a large mixing bowl, combine the flour, baking powder (if using), and brown sugar. Mix well.
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Add the chocolate mixture to the dry ingredients. Mix thoroughly until you have a smooth, uniform batter – this may take a bit of effort.
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Add the egg mixture and stir until fully combined. The batter should be creamy and rich.
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Preheat the oven to 180°C (356°F), top and bottom heat.
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Grease a cake pan with butter and pour in the batter. Tap the pan gently on the countertop to remove any air bubbles.
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Bake for approximately 35 minutes, or until a toothpick inserted comes out clean.
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Let it cool on a wire rack, then remove from the pan.