INGREDIENTS
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Shortbread Layer
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8 ounces (2 sticks) butter, softened slightly at room temperature
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1/2 cup granulated sugar
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2 cups all-purpose flour
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3/4 cup cocoa, sifted
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2 tablespoons cornstarch
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Pinch of salt
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Caramel Layer
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3 cups granulated sugar
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1/2 cup plus 2 tablespoons water
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3 tablespoons butter
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3/4 cup whipping cream, heated to lukewarm
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1/2 teaspoon Fleur de Sel or Kosher salt
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White Chocolate Layer
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14 ounces white chocolate, chopped (I prefer Lindt.)
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Seeds from 1 vanilla bean (optional)