I make a lasagna that's very similar to the one Roxy does also. However, I'll usually sub the ricotta for cottage cheese. My mom always made lasagna this way, so I didn't even realize you were supposed to use ricotta until I moved away from home! The cottage cheese has a lot more protein and less fat than the ricotta, and you don't sacrifice a whole lot of flavor. Lasagna with ricotta is a little more rich and cheesy, though.