
There’s one sandwich that seems to have everything going for it: crusty bread layered with chunks of tuna, sliced hard-boiled egg, garden tomatoes, olives and crunchy raw vegetables. Is it just a sandwich or is it salad? Both, actually. Pan bagna, is a Niçoise salad enshrined in a sandwich. It’s the perfect centerpiece for a casual picnic or terrace dining on a hot summer evening with a glass of rosé.

Pan bagna is Provençal French for moistened bread, not soaked, just softened as in bread salad. It’s essential to select a flat crusty loaf with a coarse texture that will soak up juices. Italian ciabatta bread is perfect.

Anyone who loves working with Provençal ingredients will enjoy constructing a pan bagna. Work begins at least one-and-a-half hours before serving. The bread is halved along its length and the interior is removed to make room for the filling. The surface of the bread is rubbed with a halved clove of garlic followed by the cut surface of a halved tomato. The exposed bread halves are then lightly seasoned with olive oil and red wine vinegar.
The filling consists of successive layers of white albacore tuna, sliced tomatoes, hard boiled eggs and anchovies. At this point, the sandwich looks full, but there’s more! This filling is covered with a tossed salad of romaine and basil, Niçoise olives, celery, scallions and yellow bell pepper. On other occasions I’ve substituted thinly sliced zucchini, fennel or radishes. It depends on how much crunch you want.

After mounding the salad over the filling, the hollowed-out lid of the ciabatta bread is put in place. The loaf then needs to sit an hour before serving so the juices from the filling can continue to penetrate. First wrap it tightly in plastic, then weight it evenly and hold it at room temperature for an hour or longer. Enjoy!

One pan bagna will serve eight persons. It's worth making a whole loaf even if you're only two or four. Pan bagna tastes delicious served cool from the refrigerator the next day.
Here is the link to the recipe: http://www.chezm.com/welcome-to-recipes/59-uncategorized/807-sandwich-nicoise-salad