INGREDIENTS
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10 medium yellow onions (about 4 1/2 pounds), halved, peeled, and thinly sliced
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2 tablespoons olive oil
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2 tablespoons sugar
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1 teaspoon dried thyme
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Coarse salt and ground pepper
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3 cans (14 1/2 ounces each) reduced-sodium chicken broth
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3/4 cup dry red wine
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4 slices toasted multigrain bread
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4 ounces sliced Swiss cheese