INGREDIENTS
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1 1/2 pounds thinly sliced yellow onions
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Up to 1/2 cup mild-tasting olive oil
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6 cloves garlic, thinly sliced
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Salt
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1 pound Swiss chard (thick ribs removed), cut into 1-inch-wide ribbons
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10 ounces day-old chewy peasant-style bread cut into rough 1-inch cubes
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Up to 4 cups chicken stock
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6 ounces Gruyère, coarsely grated