Lasagna (or lasagne) is a classic Italian pasta casserole dish which consists of alternate layers of pasta, cheese, a Béchamel sauce, and often a tomato sauce or a ragù (a meat or vegetable sauce). I have to tell you something that my dad did to a lasagne last week - he put mushrooms in it. Now, this works REALLY well. If you like lasagne and if you like mushrooms then you should add mushrooms inside the meat layers of a lasagne. It's to die for. Have any of you ever added your own ingredient to a lasagne?