Celery Root, Kohlrabi, And Apple Purée

1. 1

   Add celery root to a large pot of boiling salted water. Reduce heat to medium-low and simmer until tender, 11-13 minutes. Using a slotted spoon, transfer celery root to a large bowl. Return water to a boil; repeat with kohlrabi, then potatoes, cooking each separately until tender, 14-16 minutes for kohlrabi and 10-12 minutes for potatoes; add to bowl with celery root.

2. 2

   Meanwhile, bring apple and 2 tablespoons water to a boil in a small saucepan. Cover and cook over medium-high heat, stirring occasionally, until apple falls apart, 6-8 minutes, adding water by tablespoonfuls if dry.

3. 3

   Working in batches, pass celery root, kohlrabi, potatoes, and apple through a potato ricer into a large bowl. Pass mixture through ricer again if a smoother texture is desired. Stir in butter. Season with salt and pepper. DO AHEAD:

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