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Heat the oven to 170ºC. Line a cake pan with parchment paper. Reserve.
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In a bowl, mix the banana, sugar, coconut oil, milk and vanilla well.
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Add the flour, bicarbonate and salt. Incorporate.
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Take 1 cup of this mixture and place it in a small bowl. Add the cocoa and hot water. Mix.
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Drop spoonfuls of both batters into the prepared pan. With a knife or toothpick, make circles to mix the dough and create a marbled effect.
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Bake for 40 minutes or until cooked inside.