Ingredients

1/2 pound sweet potatoes, peeled and cubed
1/2 pound parsnips, peeled and cubed
1/2 pound celery root, peeled and cubed
1 pound Idaho potatoes, peeled and cubed
Salt
Freshly ground white pepper
3 tablespoons butter
1/2 cup milk

Directions

Preheat the oven to 400 degrees F. In a mixing bowl, toss the sweet
potatoes, parsnips and celery root, with the oil. Season with salt and pepper. Place on a baking sheet and
roast for 20 to 25 minutes, or until golden brown. Put the Idaho potatoes in a large saucepan and cover with
salted water. Bring to a boil, then reduce heat to medium and cook until tender, about 12 to 15 minutes.
Drain, then return the potatoes to the pot. Add the roasted vegetables and butter and stir and mash until the
butter melts completely. Add the milk and stir to mix. Season salt and pepper. Serve hot.