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["CROUTONS:", "Preheat oven to 300u00b0F.", "Place the bread cubes in large bowl.", "In a large skillet, heat oil and butter over moderate heat.", "Add the garlic and saute 1 minute, then add thyme.", "Pour over breadcrumbs and stir immediately.", "Add 1/4 cup of Parmesan cheese and toss well.", "Season with salt and black pepper to taste.", "Spread on baking sheet, sprinkle with the remaining cheese, and place in the oven for about 20 minutes, or until light brown.", "Return them to the large bowl and set aside.", "ROASTED ONION PUREE:", "Preheat oven to 450u00b0F.", "Layer 1/2"" of kosher salt in a shallow baking pan.", "Place the onions in the pan and roast, turning occasionally, until golden brown and tender, about 15-18 minutes.", "Place the roasted onions and the broth into a blender and puree; set aside.", "MUSHROOMS:", "In a large skillet, heat the olive oil.", "Add the mushrooms and saute until fully cooked and well browned.", "TO ASSEMBLE:", "Add the mushrooms and roasted onion puree to the croutons, and toss well to coat.", "Add the oil, vinegar, Parmesan and thyme.", "Mix well.", "Arrange the spinach or arugula, onions and celery on serving platter.", "Drizzle with red wine vinegar and oil.", "season with salt and pepper to taste.", "Top with crouton mixture, and garnish with additional Parmesan, as desired."]
