INGREDIENTS
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1 tablespoon butter
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3 shallots, minced
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3 bunches flat-leaf spinach, thick stems removed and leaves roughly chopped
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Coarse salt and ground pepper
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8 ounces Gruyere cheese, grated (about 2 cups)
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1 recipe Basic Pie Dough, fitted into two 9-inch pie plates
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8 large eggs
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3 cups half-and-half
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1/8 teaspoon ground nutmeg