INGREDIENTS
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For the cake:
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2 1/2 sticks unsalted butter, cut into pieces, plus more for the pan
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6 ounces bittersweet chocolate, chopped
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6 ounces unsweetened chocolate, chopped
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6 large eggs
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3/4 cup turbinado sugar
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Pinch of salt
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1/2 cup stout beer (such as Guinness)
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1 teaspoon vanilla extract