Grilled Romaine Lettuce Heart
Ingredients • 3 romaine lettuce hearts, halved lengthwise • 1 tablespoon olive oil, divided, or as needed • 2 tablespoons freshly grated Parmigiano-Reggiano cheese, or to taste • 2 tablespoons balsamic vinegar, or to taste • 2 tablespoons sherry vinegar, or to taste • 2 tablespoons olive oil, or to taste Directions 1. Preheat an…