INGREDIENTS
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135 g (4 3/4 oz/10tbsp) unsalted butter
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1/2 teaspoon salt
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55 g (2 oz/1 3/4 cups) cocoa powder
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350 g (12 oz/1 3/4 cups) granulated sugar
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1 tsp vanilla extract
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110 g (3 3/4 oz/1 cup, minus 2 tbsp) all-purpose flour
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3 large eggs
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2 tbsp icing sugar (confectioners') sugar, for dusting