Peel and evenly chop one pack of Maris Piper potatoes.
Start them in cold salted water and bring to a boil. Salt heavily and cook for 10–15 mins until soft enough to slide off a knife.
Drain and steam dry for 10 mins.
Heat 100ml oil or goose fat in 2 trays at 220°C.
Rough up the potatoes by shaking them in the colander, then place into the hot oil.
Roast for 20 mins, flip, then roast for another 20 mins until deeply golden.