Parboiled potatoes do not have to go from the saucepan straight into the roasting pan. Adding a freezer step between boiling and roasting can help create the rough, dry surface needed for a crisp exterior while the center stays soft.
The method also moves most of the prep to an earlier day. Peel, cut, parboil, dry, and freeze the potatoes ahead of time, then roast them straight from frozen when dinner is ready to go in the oven.
Parboil the Potatoes for 8 to 12 Minutes
Peel and cut the potatoes into chunks, then add them to boiling water. Give them about 8 to 12 minutes, enough time to soften the outside without cooking the pieces through.
Drain the potatoes in a colander and shake them to rough up the edges. Those uneven surfaces create more exposed potato to crisp once the pieces hit hot oil.
Let the Surface Dry Before Freezing
Return the potatoes to the pan, cover them with a clean tea towel, and leave them to steam-dry and cool for about five minutes. Removing surface moisture matters because wet potatoes have to lose that water in the oven before the exterior can begin to crisp.
Spread the cooled pieces across a baking tray with space between them. Cover the tray and freeze until the potatoes are solid, then transfer them to a freezer bag for storage.
Skip Thawing When It Is Time to Roast
There is no need to bring the potatoes back to room temperature. Heat olive oil in a roasting pan at about 200°C fan for five minutes, then add the frozen potatoes and coat them in the hot oil.
Roast for about 40 to 50 minutes, turning as needed, until the exposed edges have developed a crisp, golden crust. The softened centers remain inside while the roughed-up exterior takes the direct heat.
Freezing also makes the method useful for meals with several dishes competing for prep time. The potatoes can be prepared up to a month ahead, leaving the roasting step for the day they are served.
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