Peel and rinse the celery root and cut it into small cubes.
Heat a pan, add olive oil and saute celery root, thyme and garlic, season with salt and pepper.
Celery root must be cooked over high heat, stirring constantly until brown.
When it turns brown, add water or stock and cook covered for 25 minutes.
If desired, add seasoning, crush it with a fork or use a processor to make a puree.