Preheat the oven to 180C/360F/Gas 4.
Blanch the sweet potato wedges in boiling salted water for 4-5 minutes, then transfer to a baking sheet, drizzle over the oil and season well with salt and freshly ground black pepper. Transfer to the oven to roast for 6-8 minutes, or until tender.
For the coriander pesto, place all of the coriander pesto ingredients into a food processor and pulse until smooth.
Serve the sweet potato chips stacked on a plate with the coriander pesto drizzled around the outside.