4 celery root soup with chestnuts Recipes

unsalted butter, extra-virgin olive oil, yellow onion, chopped, peeled and coarsely chopped celery root, bottled or vacuum-packed steamed chestnuts (about 10 oz.), minced fresh thyme, chicken or vegetable stock, homemade or canned reduced-sodium, kosher or sea salt, pepper, heavy cream, divided, sliced chives , plus chive-blossom petals if you have them, for garnish

butter, divided, whole chestnuts, drained, carrot, peeled and sliced, parsnips, peeled and chopped, celery root, chopped, chicken stock, madeira wine, ground nutmeg, salt and pepper to taste, fresh parsley, chopped, cayenne pepper , or to taste, sour cream, for topping

dried porcinis, water, carrot, diced, celery, diced, parsnip, diced, shallots, finely chopped, bouquet garni (1 sprig each of bay leaf, thyme and parsley), butter, chicken stock or canned broth, coarsely chopped peeled roasted chestnuts or 12 oz bottled chestnuts, dry sherry, frizzled leeks, for garnish ( deep fry julienned strips of leek in 365 degree f oil), creme fraiche, for garnish