Sweet Success: 10 Tips For Baking the Perfect Macaron

Aging the egg whites dehydrates them, resulting in a firmer, more stable meringue. Place your egg whites in a plastic wrap-covered, nonporous bowl, and poke a few holes in the plastic with a toothpick. Leave the bowl in the refrigerator for up to three days. Be sure to bring the egg whites back to room temperature before using.