Serve these adorable cakes at a special holiday brunch and watch everyone's surprise when they discover the lemon curd "yolk" in the center. Making them is simple enough that family or friends can help. You'll need a 2 1/4- by 2 3/4-in. egg-shaped cookie cutter*; if you don't have one, make an oval out of cardboard and cut around it. You'll also need a small paintbrush and cotton swabs. If you start with the cakes still slightly frozen, they'll be easier to cut.