Grilled Caesar Salad

Name: Grilled Caesar Salad
Ingredients: 1 large egg yolk (see Tip); 2 anchovy fillets, finely chopped to a paste (about 1 1/2 teaspoons); ½ teaspoon Dijon mustard; ½ teaspoon grated garlic; ½ teaspoon Worcestershire sauce; ¼ teaspoon salt; 2 ounces Parmesan cheese, grated with a microplane (about 1 1/4 cups), divided; ⅓ cup mild olive oil plus 2 tablespoons, divided; 2 heads romaine lettuce, outer leaves removed, halved lengthwise through root; 1 medium lemon, halved crosswise; 4 (1-inch-thick) slices whole-grain bread