INGREDIENTS
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1 stick unsalted butter, plus more for greasing
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80 grams dark chocolate (I used 70% cocao)
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1-1/4 cups all-purpose flour
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1/4 cup cocoa powder
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3 teaspoons baking powder
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2/3 cup sugar
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pinch of salt
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3 large eggs, lightly beaten
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1 packed cup grated beets (about 2 medium beets)