Pan Bagnat (Pressed French Tuna Sandwich)
I'm gonna show you how to make the world's most famous tuna sandwich, which is really the world's most famous tuna salad, the Niçoise, stuffed and pressed inside a whole loaf of bread. According to people who consider things, this is considered the ultimate picnic sandwich, since it has to be made ahead, and the longer it sits in its own juices, the better.
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The French say this sandwich is not properly done unless there is oil dripping from it when you're eating, so don't be shy with the oil. Also, the longer it sits in the fridge being pressed, the better.
You can use a flatter loaf, such as ciabatta instead of a French loaf.
You can use any vinegar of your choice.
You can use any fresh, roasted, or pickled pepper you like instead of banana peppers, and add any ingredient you like, such as artichoke hearts, sliced fennel, or maybe some blanched green beans.