In a large bowl, place the tuna, cannellini beans, celery, onion, cornichons, dill and lemon juice. Give it all a mix until combined. Season well.
180 g canned tuna, 400 g canned cannellini beans, 3 celery sticks, 0.5 red onion, 0.5 cup cornichons, 0.333 cup dill, 0.5 lemon