A classic cheesecake is all about the dense creamy filling. Here, it's made easy by using a high-powered blender. Be sure your cream cheese is very soft, to avoid lumps. Lemon zest adds a subtle perfume to this version, but feel free to play with other flavorings, such as vanilla, espresso powder, maple, or orange zest. The recipe is a Yummly original created by Martha Holmberg.