INGREDIENTS
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1 large yellow onion, thickly sliced
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One 4- to 5-pound roasting chicken
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2 small lemons, quartered
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2 tablespoons unsalted butter, melted
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6 cups bread cubes, each 3/4 inch thick, from a baguette, boule, or other artisanal loaf
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2 tablespoons olive oil, plus more for the onions
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1/2 teaspoon kosher or sea salt, plus more to taste
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1/4 teaspoon freshly ground black pepper, plus more to taste