First, cook the pasta, then warm the milk until small bubbles start to appear on the edges, stir it in the meantime. Mix the corn flour and five spoons of warmed milk in a small pot. Pour the mixture in the remaining milk and stir on very low heat until it becomes dense. Add 130 g of mozzarella, salt, pepper and mix well. In another pot simmer the spinach and drain it completely.

Then take a large baking tray, place the pasta in it, add the cheese sauce, spinach and walnuts. Mix everything well and sprinkle it with the remaining mozzarella (50 g). Bake the dish in an oven until it becomes golden brown (5 to 10 minutes).