INGREDIENTS
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1 1/2 cups all-purpose flour
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1 cup superfine sugar
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1 teaspoon baking powder
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1/2 teaspoon baking soda
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1/3 cup best-quality cocoa
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1 1/2 sticks soft unsalted butter
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2 large eggs
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2 teaspoons good-quality vanilla extract
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2/3 cup sour cream
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Special equipment: 2 (each 8-inch diameter) layer tins with removable bases, buttered
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6 ounces good-quality semisweet chocolate, broken into small pieces
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3/4 stick unsalted butter
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2 1/2 cups confectioners' sugar
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1 tablespoon light corn syrup
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1/2 cup sour cream
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1 teaspoon good-quality vanilla extract
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Sugar flowers, to decorate, optional