Steps
1. Peel and dice the beetroots and celery root into small cubes.
2. Peel and finely chop the onion.
3. In a pot, heat olive oil over medium heat and sauté the onion until translucent.
4. Add beetroot and celery root cubes, stir for 2-3 minutes.
5. Pour in the vegetable broth and bring to a boil.
6. Reduce heat and simmer for 20-25 minutes until vegetables are tender.
7. Meanwhile, core and chop the apple.
8. Once vegetables are soft, add the chopped apple to the pot and cook for an additional 5 minutes.
9. Use a blender or immersion blender to puree the soup until smooth.
10. Season with freshly ground pepper, salt, and orange juice, stirring well.
11. Serve hot, garnished with fresh garden cress on top.