I love lemon cakes, pies, cookies, etc. This cake is the best! It comes from Cook's Illustrated Magazine, Mar/Apr 07 edition. As always, they area very precise with their directions, so they might be long, but don't be put off by that. The filling can be made a day ahead, it does get a little stiff, just stir it to loosen it up a bit. Chill leftovers.