INGREDIENTS
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1 pound yellow onions, sliced
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3 tablespoon olive oil
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¼ teaspoon salt
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1 teaspoon balsamic vinegar
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½ cup mayonnaise, regular or light
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3 teaspoons worcestershire sauce
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1 teaspoon garlic powder
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½ teaspoon parsley flakes
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Pinch of dried thyme
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8 slices deli sliced swiss or provolone cheese
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8 slices bakery fresh sourdough bread
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1-2 tablespoons butter