Spreading a tangy tuna dressing on the cut sides of the ciabatta allows it to get absorbed into the bread, giving the sandwich plenty of flavor while making it easier to eat.
The pan bagnat is essentially a Niçoise salad in sandwich form. For this version, tuna is pureed with red wine vinegar, olive oil, anchovies, and garlic to form a unique sandwich spread inspired by tonnato sauce. Spreading a tangy tuna dressing on the cut sides of the ciabatta allows it to get absorbed into the bread, giving the sandwich plenty of flavor while making it easier to eat.