Plunge the beans into a pan of boiling water, boil for 4 minutes until crisp and tender. Drain and transfer to a bowl of cold water to cool.
Cook the potatoes in lightly salted water for 12 minutes or until tender. While the potatoes are cooking, whisk together the ingredients for the dressing in a medium bowl. Season with salt and pepper.
Drain the potatoes and rinse under cold water, then (if preferred) remove the skins and slice thickly. Add to the dressing while still warm and toss together. Allow to cool.
Cut the tomatoes into quarters and add to the cooled potatoes. Drain the beans and cut into 2.5 cm lengths and add to the salad with the red onion and shredded basil leaves. Mix together then serve.
Filippo Berio’s classic, balanced Extra Virgin Olive Oil. Taken from the first cold pressing of the olives, this oil is ideal for sauces, marinades, drizzling and dipping.