How to Make It
Heat the oil in a large saucepan over medium heat. Add leek, garlic and ginger and sauté for 10 minutes, stirring periodically.
Add celeriac, beets, salt and 6 cups of filtered water. Bring to a boil over high heat, reduce heat to a simmer and cook for 30 to 35 minutes, until vegetables are soft throughout.
Puree soup in a blender in batches, taking care not to splash the hot liquid. Adjust salt and add pepper to taste. Serve warm garnished with avocado cubes and cilantro leaves.