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1/4 cup extra-virgin olive oil |
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1 tablespoon Worcestershire sauce |
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1/4 teaspoon freshly ground black pepper |
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1/4 teaspoon garlic powder |
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4 portobello mushrooms, sliced 1/4 inch thick |
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2 yellow onions, halved and thinly sliced |
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Kosher salt and freshly ground black pepper |
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4 ounces blue cheese, crumbled |
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1/3 cup mayonnaise or plain yougart |
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Balsamic vinegar, for drizzling |
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