In a small bowl whisk together vinegar, mustard, basil, salt and pepper. Slowly add oil while whisking constantly to emulsify. If using right away, let sit at room temperature. Refrigerate after using but let come to room temperature before using.
Spoon dressed romaine onto a large plate and arrange with peppers, artichokes, olives, pepperoncini, tomatoes, onion and cold cuts.
Whisk vinaigrette again and drizzle over salad. Serve with some crusty bread and butter.