Peel the red onion and slice it as finely as you can.
In a large bowl, scrunch it with ½ a tablespoon of red wine vinegar and a little pinch of sea salt.
Trim and finely slice the celery and pile on top of the onion.
Finely slice the parsley stalks, add to the bowl, then pick over the leaves.
Drain the beans and place in a single layer in a hot non-stick frying pan on a medium-high heat with 1 teaspoon of olive oil.
Have faith, let them crisp up and get golden on the bottom, then turn so they crisp up on the other side.
Drizzle 1 tablespoon each of extra virgin olive oil and red wine vinegar over the onion salad, drain and flake in the tuna, then gently toss it all together.
Divide the popped beans between your plates, pile the salad on top and sprinkle from a height with a good pinch of black pepper, then tuck in.