INGREDIENTS
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1 pound dense country white bread, cut in 3/4-inch cubes
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6 tablespoons unsalted butter, plus more for greasing the baking dish
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2 leeks, halved lengthwise
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4 to 6 ounces button or wild mushrooms, sliced 1/3-inch thick
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Oil
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1 1/2 cups thinly sliced celery
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2 to 3 teaspoons crumbled dried sage
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1 1/2 teaspoons dried thyme or dried marjoram, or a combination
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1 teaspoon salt
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1/2 teaspoon freshly ground black pepper
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3 cups chicken or turkey stock
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2 large eggs
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1/2 teaspoon baking powder
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Fresh sage or thyme sprigs, for garnish