Surprisingly moist, light, and springy, this almond cake is a delicious departure from the dense, rustic ones you might be accustomed to. We use six beaten egg whites to give the cake lots of lift—without the use of leavening agents, which are forbidden on Passover. Because traditional versions of almond extract and powdered sugar can contain spirits and cornstarch (respectively), be sure to seek out kosher-for-Passover versions. (You can find kosher almond extract here and kosher powdered sugar here on Amazon.) Also, check the label on your cooking spray for any ingredients that aren't permitted; you can grease the pan with mild-flavored olive oil if your cooking spray doesn't comply.