Sweet Potato Soup with Lobster and Orange Crème Fraîche

Preparation

1. Step 1

   Mix cream, sour cream, 1 1/2 teaspoons ginger and orange peel in medium bowl to blend. Let stand until thickened, about 3 hours. Cover crème fraîche and refrigerate.

   Step 2

   Preheat oven to 400°F. Melt 4 tablespoons butter in large pot over medium heat. Remove from heat. Add sweet potatoes and sugar and toss to coat. Arrange sweet potatoes on 2 baking sheets. Roast until very tender and starting to brown, stirring occasionally, about 30 minutes.

   Step 3

   Melt 4 tablespoons butter in same pot over medium heat. Add leeks, celery and remaining 1 1/2 teaspoons ginger and sauté until leeks begin to soften, about 5 minutes. Add roasted sweet potatoes and sauté 2 minutes. Add 10 cups broth and orange juice. Bring mixture to boil. Reduce heat and simmer until leeks and celery are very tender, about 20 minutes.

   Step 4

   Working in batches, puree soup in processor. Return soup to pot. Thin with more broth, if desired. Season with salt and pepper. (Crème fraîche and soup can be made 2 days ahead. Cover separately; chill.)

   Step 5

   Remove lobster meat from shells. Slice into 1/3-inch-thick medallions. Melt 2 tablespoons butter in heavy large skillet over medium heat. Add lobster; sauté until heated through, about 1 minute.

   Step 6

   Bring soup to simmer. Ladle into bowls. Spoon small dollops of crème fraîche atop soup. Draw skewer through crème fraîche to form design. Arrange lobster atop soup. Sprinkle with parsley.