Bring cauliflower, celeriac, garlic and chicken stock to a boil over medium-high heat. Cover, reduce heat and simmer until vegetables are tender, 15-20 minutes.
Carefully transfer to Vitamix and puree until smooth.
Add ghee, salt & pepper and blend to combine.
Top with bacon and chives.
Video
Notes
For dairy-free: use olive oil instead of ghee For vegan: use vegetable stock instead of chicken stock, use olive oil instead of ghee, and substitute coconut bacon for the bacon