Going against the flow here. No offense meant, but:
This pure bred Italian girl is appalled at the idea buying ready made lasagna. Yuk ! Double yuk! Using jar sauce is almost as bad simply buying the whole thing. Maybe worse, because you go through most of the work of making the lasagna and still you end up with one that tastes like ready made.
And along that same line is using fresh tomatoes. Store bought fresh tomatoes are a joke. You might as well eat wax imitations. But although home-growns taste good, they are not the same as what the canning companies have. So you would have to blanch and peel and seed them, then cook just the tomatoes for hours to get the acid low enough, and in the end it will still not taste as good as using commercially canned tomatoes and tomato paste. My favorite brand is Redpack, but Contadina, or Hunts are both good. And if you can find the Italian plum style canned, even better.
For decent lasagna you've just got to make it yourself, including the sauce.
I use mozzarella, Ricotta and romano. If you want my family recipe send me a PM. I don't frequently share our family recipes. But honestly it doesn't really contain any secret ingredient. The real secret ingredient to good lasagna is that you've got to do the work.
One more comment: I've given my recipe to friends, who later came back to me and commented, with a quizical tone, that it didn't taste the same as when they ate at my house. They thought there must be something wrong with the recipe I gave them cause their family didnt like it much.
Sure they substituted Kraft Parmesean for the Romano, and cottage cheese for the ricotta, and Jar sauce for the homemade. But, "gee, other than that, followed the directions, just like you said." They just couldn't figure what went wrong. :dizzy
If you like to substitute, just don't tell anyone you got the recipe from me.