Step 2
Sift flour, superfine sugar and baking powder into the bowl of an electric mixer. Begin mixing on low speed, then add crème fraîche or cream. Increase speed to medium, and beat in eggs, one at a time, then butter. Gently fold lemon segments and juices and 3 tablespoons zest into batter. Scrape into pan, and bake 15 minutes. Use a sharp knife to cut an incision lengthwise down middle of cake, and bake 30 minutes longer. Lower oven to 325 degrees, and bake 40 to 45 minutes longer, or until a tester comes out clean.