INGREDIENTS
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4 Tbsp extra virgin olive oil
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3⁄4 cup finely diced red onion
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1⁄2 lb bacon, 1⁄4-inch dice
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1⁄2 cup balsamic vinegar
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3 Romaine lettuce heads, cores removed and leafy ends trimmed, cut in half lengthwise
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1⁄2 cup crumbled blue cheese
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Freshly cracked black pepper