Sweet potato makes for a nutritious and satisfying substitute for pasta in this lasagna recipe. Even if your attitude about these sorts of things is if it aint broke, the odds are good that youll enjoy this alternative version. White sweet potato is mildly sweet and pleasantly earthy, making it more flavorful by far than your average noodle. Like regular lasagna, this recipe takes time. However, it also keeps well, so it's a good dish to prepare ahead of time for a quick reheat on a busy weeknight.