Reserve the shallot skins, scrubbed Jerusalem artichoke skins for your next vegetable stock.
Boil a kettle of water. Add 300ml water to the dried shiitakes and lemon verbena leaves, set to one side and leave to infuse and rehydrate for 20 minutes.
Heat a medium/large stock pan with the tablespoon of olive oil on the hob. Add the shallots and bay leaf, sweating on a low/medium heat till soft and glossy.
Finely slice the Jerusalem artichokes and add to the pan with 100ml of the vegetable stock (this is to stop the vegetables sticking). Follow with the oregano leaves and fresh ginger.
Season well with smoked salt and black pepper, then leave to soften for 5 minutes before adding the apple. Cook on a low/medium heat for another 10 minutes until the Jerusalem artichokes are very soft. Add a little more of your stock if the vegetables start to stick.
Add the rehydrated shiitakes in thin strips, the remainder of the bone broth and the lemon verbena and shiitake water.
Remove from the heat, and with a hand blender blitz till the soup is creamy. If you would like it a little thinner, add a little water to your desired consistency.
Top with fresh apple slices to add crunch and freshness or dehydrated fresh shiitake mushrooms to enhance the immune boosting properties of this soup.