Grilled Romaine with Spicy Caesar Dressing

Name: Grilled Romaine with Spicy Caesar Dressing
Ingredients: 3 tablespoons mayonnaise; 1 tablespoon Dijon mustard; 2 teaspoons Worcestershire sauce; 2 tablespoons red wine vinegar; 1/4 small red onion, coarsely chopped; 6 cloves roasted garlic; 3 anchovies; 1 chipotle in adobo; 2 dashes hot sauce; 1 to 2 tablespoons honey; Salt and freshly ground black pepper; 1/2 cup canola oil, plus more for brushing on the romaine; 1/4 cup grated Parmesan, plus shaved Parmesan, for garnish; 1 large head romaine lettuce, outer leaves removed, cut in half from tip to root