Grilled Hearts of Romaine
Ingredients:
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3 romaine lettuce hearts, halved lengthwise
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1 tablespoon olive oil, divided, or as needed
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2 tablespoons freshly grated Parmigiano-Reggiano cheese, or to taste
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2 tablespoons balsamic vinegar, or to taste
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2 tablespoons sherry vinegar, or to taste
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2 tablespoons olive oil, or to taste