1. Peel the celeriac and reserve the peelings.
2. Take the peelings and place them on a tray. Cook them in an oven on its lowest setting overnight to dehydrate.
3. Turn up the oven to 180°C. Take the dehydrated celeriac skin and roast them in the oven till they turn dark brown.
4. Remove the peelings from the oven and let them cool. Thereafter, blend the peelings into fine powder with the mill grinder attachment.
5. Mix 2 parts of celeriac powder with 1 part of salt. Put them in an airtight container and store them in a cool, dry place.
6. Dice the celeriac into 1cm chunks. Next, melt the butter in a pot, then add in salt and celeriac, and stir.
7. Cover the pot with a cling wrap and cook it over medium heat. Once you see steam in the pan, lower the heat and cook for another 10 minutes.
8. Remove the cling wrap, then add in cream. Continue to cook till the celeriac is soft to the touch.
9. Scrape the mix into a blender. Add mineral till the soup reaches your preferred consistency, add truffle oil and blend.
10. Heat the soup gently. Drizzle a little olive oil and sprinkle abit of celeriac charcoal salt before serving. Serve with fresh sourdough.
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