Serves: 6 to 8
3 pounds medium white turnips, peeled and quartered
3 pounds Idaho potatoes, peeled and quartered
1 stick unsalted butter; cut into tablespoons
1 cup milk
Freshly ground white pepper
¼ cup fresh flat-leaf parsley leaves
1. In a large saucepan, cover the potatoes with water and bring to a boil over high heat. Stir in 2 teaspoons of salt and boil for 5 minutes.
2. Add the turnips and boil until the potatoes and turnips are tender when pierced, about 15 minutes. Drain in a colander.
3. Return the potatoes and turnips to the saucepan and, using a potato masher or a large spoon, mash with the butter and milk. Season with salt and white pepper.
4. Transfer the mashed vegetables to a large, shallow, heat-proof serving dish.
5. Decorate the border with the parsley and serve.
NOTE: This dish can be made up to 1 day ahead. Let cool, then cover and refrigerate. Return the vegetables to room temperature, then rewarm in a 400 degree oven. If necessary, stir in extra milk, then dot with extra butter.