Jamie Oliver recommends pressing partly cooked roasties with a masher for extra crispness but every time I've tried that my spuds have fallen to pieces. Guess I'm just too heavy handed :(
Parboil. Drain. Shake slightly to 'flour' them. Roast in already hot duck fat. Sprinkle with coarse salt to your taste. Roast until crisp and brown. Nice
Preheat oven to 450 degrees F (250 degrees C). Place potatoes in a large roasting pan and toss with oil, salt, pepper, and rosemary until evenly coated. Spread out potatoes in a single layer. Bake in preheated oven for 20 minutes, stirring occasionally.