Instructions
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Line the bottom and sides of a loaf pan with parchment paper.
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Preheat the oven to 350°F (175°C).
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Sift together the flour, almond flour, and baking powder. Set aside.
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Mix the simple syrup and rum to make the rum syrup. Set aside.
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Melt the dark chocolate, milk chocolate, and butter using a double boiler or microwave.
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Add the sugar and invert sugar to the melted chocolate mixture and whisk until smooth.
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In a separate bowl, lightly beat the eggs.
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Add the eggs to the chocolate mixture in three portions, mixing well after each addition.
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Add the dry ingredients and whisk gently until fully combined.
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Pour the batter into the prepared pan and smooth the top with a rubber spatula.
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Reduce oven temperature to 325°F (160°C) and bake for 45–50 minutes.
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The cake is done when a toothpick inserted into the center comes out clean.
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While the cake is still hot, brush the top generously with the rum syrup.
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Cool the cake in the pan on a rack for 30 minutes, then wrap tightly and refrigerate overnight.
Chocolate Glaze
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Melt the chocolate and coconut oil in a heatproof bowl set over simmering water, stirring until smooth.
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Pour the warm glaze over the chilled cake.
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Spread evenly using an offset spatula.
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Refrigerate for 20–40 minutes, until the glaze is set.