
Lasagna bolognese is a rich, delicious casserole, and a great way to feed a crowd. Assembling it takes a couple days of largely hands-off work. It's worth it.
Preheat oven to 375°F. Cook pasta according to package directions. Drain and rinse. Lay noodles in a single layer on a baking sheet, separated by sheets of parchment paper.
Stir together ricotta, egg, parsley, nutmeg, and 1/2 cup Parmesan in a bowl. Season with salt and pepper.
Spread 1/3 cup Bolognese sauce in a 9-by-13-inch baking dish. Top with a layer of noodles (cutting to fit if necessary), one-third of ricotta mixture, and one-third of mozzarella. Repeat three more times until pan is full, ending with ricotta mixture and mozzarella. Sprinkle with remaining 1/2 cup Parmesan.