Sandwiches need to be extra special to make it to dinner (no PB and Js here). Everyday Food editor Sarah Carey shows you how to make this hearty meal.
In a medium bowl, whisk together mustard, vinegar, and oil. Add celery and radishes, toss, and season with salt and pepper.
Spread pesto on bread and top with prosciutto, if using, egg, and Parmesan. Drizzle with oil, sprinkle with pepper, and serve with salad.