That's the American term for the pasta and the dish, it appears. The dictionary says: "Lasagna: abakeddishconsistingoflayersofthispasta,cheese,tomatosauce,andusuallymeat." In French, I think you usually see the word spelled as lasagne, and the plural is lasagnes, just as the plural of spaghetti is written spaghettis.
Anyway, we made lasagna with zucchini (courgettes) and onions yesterday. Or Walt did.
He cut the zucchini into fairly thin strips and the onions into thin slices. He brushed the vegetables with olive oil and put them in the oven to roast on cookie sheets until they were tender.
Then he made the lasagna using ricotta cheese and parmesan cheese, not to mention a meat sauce made with tomato puree from last year's garden and some saucisses basques — pork and veal sausage meat seasoned with piment d'Espelette and other spices — and baked the dish in the oven for 30 to 40 minutes.