INGREDIENTS
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Vegetable-oil cooking spray
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1 cup warm water
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1/2 cup unsweetened natural cocoa powder
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1 1/2 cups all-purpose flour
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1 cup granulated sugar
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3/4 teaspoon baking soda
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1/2 teaspoon salt
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1/2 cup sunflower oil
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1 tablespoon pure vanilla extract
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2 teaspoons distilled white vinegar
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2 ounces dark chocolate (preferably at least 70 percent cacao), finely chopped
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1/2 cup confectioners' sugar, sifted
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2 tablespoons water