INGREDIENTS
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2/3 cup heavy cream
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1/2 cup Lyle's Golden Syrup, or light corn syrup
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1/3 cup dark brown sugar
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1/4 cup Dutch-processed cocoa powder
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1/4 teaspoon sea salt
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6 ounces bittersweet chocolate, chopped, divided in half
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2 tablespoons unsalted butter
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1 teaspoon vanilla extract