Wash the potatoes (you don't need to peel them unless you want to) then slice into wedge shapes. Place in a large bowl, add the oil and marinade and mix well. Cover and leave for an hour or longer in the fridge.
Preheat the oven to 200°C. Place the wedges on two lightly greased non-stick baking trays and roast for 30-40 minutes, turning halfway, or until soft on the inside and crispy on the outside.