After they are frozen and just before you serve them, you need put a 1 ounce dollop of creme fraiche on top and then sprinkle with the candied lemon zest and serve. (marthastewart.com)
If you like a slightly creamier soup, stir in a generous dollop of creme fraiche after pureeing. (101cookbooks.com)
Serve with a pancetta crisp on top and an extra dollop of creme fraiche with some chopped tarragon mixed in. (strawberriesforsupper.com)