Uh, this is so good with something meaty.
1 celeriac root for each
Wash, peel and cut potatoes and celeriac in same size pieces.
Boil in salt water until soft (25 min.).
Pour off water & add butter, sour cream, salt, pepper & nutmeg to taste. Smash it all with your potato smasher. Eat quickly before you have to share with others.