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Boil the potatoes for about 15 minutes, until tender. Meanwhile, make the dressing.Whisk the oil, lemon juice, chilli powder and garlic in a bowl big enough to take all the salad. Tip in the cannellini beans, onion and parsley.
Drain the potatoes and when cool enough to handle cut them in half lengthways. Now gently stir the potatoes into the salad and flake in the tuna. Pile on to a bed of salad leaves, drizzled with a little extra olive oil.