Slice the potatoes crosswise at regular intervals of about 2 mm, taking care to keep each potato whole.
Arrange the potatoes in an ovenproof dish. Oil the base of the dish.
Brush the potatoes with the pesto sauce using a silicone brush, taking care to put the sauce between the cuts in the potatoes by spreading each incision with a knife.
Season with salt and pepper.
Place in the oven for approximately 45 minutes.
Cover with aluminium foil when the potatoes have a nice colour.
Tips and advice
To make sure you don’t cut the potatoes all the way through, you can place them between two wooden chopsticks. This way, the chopsticks will stop your cut at the right height. Depending on the size of the potatoes, the cooking time will vary. It’s best to choose special oven potatoes, and for even cooking, use potatoes of the same size.