INGREDIENTS
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1/2 stick unsalted butter, chilled, cut into 1/2-inch pieces, plus more for greasing pan
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Eight 4 1/2-inch-long plain or almond biscotti cookies, coarsely broken (about 5 1/2 ounces)
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1/4 cup packed dark brown sugar
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3/4 cup cherry preserves or jam, such as Bonne Maman
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12 ounces semisweet chocolate chips, such as Ghiradelli
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1 cup heavy cream
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1/2 cup dried cherries
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3/4 cup chopped shelled pistachio nuts
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Salt flakes, such as Maldon, optional