1 kgsmall Dutch cream or small Sebago potatoes, scrubbed and halved100 gmduck fat1garlic head, cloves separated2 tbsprosemary leaves
Preheat oven to 200C. Place potatoes in a large saucepan of cold salted water, bring to the boil over high heat and cook until just starting to soften (8-10 minutes), drain immediately and return to saucepan. Shake pan vigorously to roughen edges of potato.
Heat duck fat in oven in a roasting pan large enough to hold potatoes in a single layer until very hot (4-5 minutes). Add potatoes, garlic and rosemary to pan, shake carefully to coat in duck fat, season generously and roast until dark golden and crisp (25-30 minutes), serve immediately.