In a large saucepan, combine potatoes, celery root and garlic cloves. Pour over enough water to cover and set pan over high heat. Bring to a boil, reduce heat to medium and simmer 10 minutes, until potatoes are fork-tender.
Drain and transfer potatoes, celery root and garlic to a large bowl. Add buttermilk and olive oil and mash until smooth (or lumpy, whatever you like!). Fold in chives. Season, to taste, with salt and black pepper.
Copyright 2006, Robin Miller, All Rights Reserved