Heat a little olive oil in a saucepan and sauté the shallot and garlic.
Peel and chop the celeriac and Jerusalem artichokes. Add to the pan and sauté until the vegetables are soft.
Add the vegetable stock and bring to a boil, let cook for about 10 minutes.
Blend with an immersion blender or hand blender until the soup is creamy. Season to taste with salt and pepper.
Make the parsley oil by chopping the parsley very finely and mixing it with some olive oil. Serve the Jerusalem Artichoke soup with a drizzle of the oil and enjoy!