Instructions: Celeriac, also known as celery root, it a rather ugly, round, knobby thing and is actually the root of a special type of celery grown for its root. It lends a lovely celery flavor to this dish without all the strings that regular celery would contribute.

Boil the potatoes and celeriac in salted water until tender, about 20 minutes. Drain and mash with a fork or potato masher, or force through a food mill. Stir in the milk, butter, salt, and pepper. Garnish with chopped fresh herbs.

Serves 4 to 6.

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