INGREDIENTS
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1 (12 ounce) package mild Italian pork sausage
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1 large apple, diced
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salt
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1 egg
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1 egg yolk
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1 (14.1 ounce) package pastry for 9-inch double-crust pie
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1/4 cup finely grated Parmesan cheese, divided
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2 teaspoons thyme leaves, roughly chopped, divided
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freshly ground pepper to taste