INGREDIENTS
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1-pound loaf sourdough bread
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8 tablespoons butter
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10 ounces cremini mushrooms, sliced 1/2-inch thick in both directions
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Salt and freshly ground pepper
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2 to 4 stalks celery with leaves, halved lengthwise and sliced
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1 medium onion, chopped
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About 10 sprigs fresh thyme, leaves stripped from the stems
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10 to 12 fresh sage leaves, chopped
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3 1/2 cups low-sodium chicken broth
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3 tablespoons chopped Italian parsley leaves