Grilled Salad with Herbed Vinaigrette

Name: Grilled Salad with Herbed Vinaigrette
Ingredients: 2 tablespoons white wine vinegar; 1 fillet anchovy, minced, optional; 1 teaspoon Dijon mustard; 1 teaspoon kosher salt, plus more for seasoning; Freshly ground black pepper; 1/3 cup extra-virgin olive oil, plus more for brushing; 1/4 cup roughly chopped parsley leaves; 3 tablespoons chopped tarragon leaves; 4 portobello mushrooms, stems removed and discarded; 4 ripe plum tomatoes, halved; 1 head romaine, quartered, root end attached