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Peel asparagus.
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Chop into pieces.
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Cut the orange in half. Scrape a large peel off one of the halves. Zest the other half.
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Juice the orange halves.
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Add 6 cups water, the asparagus peels, orange peel and juice, 1 tablespoon of butter kosher salt and sugar to a pot.
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Bring to a boil. Turn the heat down and simmer for 20 minutes.
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Peel and dice the potato.
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Strain the orange and asparagus peels reserving the liquid in the pot.
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Boil the white asparagus, potato and arugula in the broth for about 15 minutes.
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Peel and dice the shallot. Fry in the remaining butter until translucent.
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Pour in the wine and reduce by half. Add to the pot.
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Finely puree the asparagus and potatoes in the stock.
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Stir in 3/4 of the mascarpone.
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Cook for another 5 minutes.
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Season with salt, pepper and sugar if needed.
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Mix the remaining mascarpone with the orange zest.
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Distribute the soup into 4 bowls.
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Top each with a dollop of the orange mascarpone and serve.