"Beer - it's not just for drinking any more!..."
INGREDIENTS
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4 ounces unsalted butter
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10 ounces dark brown sugar
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2 medium eggs, beaten
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6 ounces plain flour
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1/4 teaspoon baking powder
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1 teaspoon baking soda
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7 fluid ounces Guinness stout (or other Irish stout)
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2 ounces cocoa powder
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4 ounces chocolate
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2 tablespoons Guinness stout
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2 ounces butter
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4 ounces icing sugar, sifted
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1 ounce walnuts, finely chopped