Celeriac & Yukon Gold Purée

The little bit of horseradish brightens up this earthy mash, which makes a great side dish for a pork roast or chops. The best way to peel celeriac is with a sharp paring knife. For a smooth purée, use a ricer or food mill. You can make this with a hand-held potato masher, but it will be lumpy and decidedly rustic.

• 1-1/2 lb. celeriac (1 large or 2 small), peeled and roughly chopped
• 1-1/2 lb. Yukon Gold or russet potatoes, peeled and cut into chunks
• 1 Tbs. plus 1-1/2 tsp. coarse salt
• 3/4 cup milk or half-and-half
• 3 Tbs. unsalted butter
• 2 Tbs. grated fresh or prepared horseradish, or to taste
• Fresh lemon juice to taste (I use 1 scant tsp.)
• Freshly ground white pepper

Tip:

Celeriac needs to be peeled with a knife, rather than a vegetable peeler.

Put the celeriac and potatoes in a pot, cover with water by at least an inch, and add 1 Tbs. of the salt. Bring to a boil. Reduce the heat to medium, cover partway, and cook until very tender, 20 to 25 min. Drain. Return the vegetables to the pot and set it over medium heat for 1 to 2 min., shaking and stirring to evaporate any excess water. Rinse a small saucepan in cold water (this will make the pan easier to clean later); pour in the milk (or half-and-half). Bring to just below a simmer over medium heat; set aside. Force the vegetables through a ricer or food mill and return them to the boiling pot. Beat in the butter with a wooden spoon. Add the milk to the potatoes a little at a time, beating vigorously after each addition. Stir in the horseradish and lemon juice. Add the remaining 1-1/2-tsp. salt, season with pepper, and serve.