Potato Celeriac Mash

Directions

1. 1
   Cut the potatoes in half and the celeriac into quarters.
2. 2
   Place in a large pot and fill with cold water so that the potatoes and celeriac are covered by a few inches.
3. 3
   Add 1 teaspoon salt and place a smaller pot lid on the vegetables to keep them submerged.
4. 4
   Bring to a boil.
5. 5
   Cook until tender (vegetables should be easily pierced with a paring knife), 15 to 20 minutes.
6. 6
   Drain and return the vegetables to the hot pot to remove excess moisture.
7. 7
   Put the potatoes and celeriac through a food mill or ricer, or mash them well using a fine potato masher.
8. 8
   (If mashing, slide off and discard the potato skins.)
9. 9
   Combine the vegetables with the milk and stir in the butter.
10. 10
    Season with 1 teaspoon salt, or more to taste, and pepper.
11. 11
    Serve immediately.