INGREDIENTS
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Nonstick cooking spray, for spraying the foil
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2 teaspoons olive oil
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2 medium shallots, finely chopped
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9 ounces cremini mushrooms, sliced into 1/4-inch-thick slices
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5 ounces baby spinach leaves
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Kosher salt and freshly ground black pepper
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All-purpose flour, for rolling out the pastry
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2 sheets frozen puff pastry, thawed
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1 large egg, beaten
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One 2-pound side of salmon fillet, skinless
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2/3 cup clam juice
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3/4 cup Mexican crema
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1/2 cup heavy cream
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2 teaspoons all-purpose flour
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3 tablespoons minced fresh dill
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Kosher salt and freshly ground black pepper