Stuffed Lasagna with Beef, Spinach, and Ham (Lasagna à la Nice)

Brown the meat, ham, and beef with a little butter and all seasonings

Process everything through a food processor together with the cooked spinach previously simmered in water and salt, then well squeezed out

Add one cup of Béchamel sauce

Cook the lasagna in small batches in a large pot with boiling salted water, not letting it become too soft

Remove from boiling water and plunge into a bowl with cold water

Place half a cup of milk at the bottom of a baking dish

In the same baking dish, arrange a layer of lasagna, a layer of filling, another layer of lasagna, a layer of tomato sauce and grated cheese, another layer of lasagna, a layer of filling, sauce, and so on until the end

Cover with slices of mozzarella spread some little knobs of butter on top and put in the hot oven until the mozzarella melts.