| dish: side|
Cook celeriac in large saucepan of boiling salted water 15 minutes. Add potato and boil until celeriac and potato are very tender, about 15 minutes longer. Drain. Return to same saucepan; stir over medium-high heat until any excess liquid in pan evaporates, about 2 minutes. Add cream and butter; mash until mixture is almost smooth. Season to taste with salt and pepper.
Bon Appétit, February 2005