This is nice served with seared duck breast with a red wine reduction and petite green beans.

1/2 lb. celery root, peeled and diced
2 lbs. red potatoes, diced
1/2 tsp. pepper
1/2 stick butter
1/4 cup cream
1/4 cup milk
1/2 tsp. celery salt

1/2 lb. celery root, peeled and diced 2 lbs. red potatoes, diced 1/2 tsp pepper 1/2 stick butter 1/4 cup cream 1/4 cup milk 1/2 tsp celery salt

Cook veggies in water til tender. Heat liquid in microwave. Whip everything together in a stand mixer.