Peel, parboil for 10 minuets. Next spray a roasting tin with fry light.
Put potatoes in the tin then pour Oxo 1/3 to 1/2 way up the side of the potatoes, spray the top and put in oven (200C).
Cook for 30 minuets then check – Oxo should just be mainly gone and they should look golden brown and be soft.
When you check at 30 mins – give them a spray of the butter fry light and leave for another 5 min (or more – can take up to 45mins-1hr)
I normally make up 500 ml of oxo with 4 cubes in.