Potato and Celery Root Mash

Ingredients

• 1  juice of lemon 
• 20 servings salt and pepper 
• 4 tablespoons butter unsalted cut into small pieces
• 1 cup milk whole
• 8  yukon gold potatoes peeled cut into 1-inch chunks ()
• 2  celeriacs trimmed peeled cut into 1-inch chunks (celery root)

Equipment

• food processor
• bowl
• pot
• potato masher
• potato ricer

Directions

1. Place celeriacs in a bowl. Cover with cold water; stir in lemon juice.
2. Let stand while preparing remaining ingredients.
3. Drain when ready to boil.
4. Place potatoes and celeriacs in separate pots; cover with cold water.
5. Add a large pinch of salt to each pot; bring to a boil over high heat. Reduce heat to medium-low; cook until vegetables are very tender, about 30 minutes for potatoes and 15 to 20 minutes for celeriacs.
6. Drain celeriacs. Pulse in a food processor until smooth.
7. Drain potatoes, return to pot and add celeriacs, milk and butter. Mash with a potato masher or put through a ricer. Season with salt and pepper.
8. Serve.