Preheat the oven to  200°C

Parboil the potatoes in lightly salted water until almost cooked through,drain and cool.

Cut in half and place with the peppers and onions on a lined baking tray and season well.

Drizzle over the olive oil and roast in the oven for 35-45 minutes or until golden brown and crispy.

Leave to cool for 15 minutes then toss with mayo and scatter with fresh basil leaves