Traditional Lasagne Bolognese
This lasagne was designed for a deep-dish baking pan. You can use a standard 9 × 13-inch baking pan, but you will have excess sauce; the sauce can be frozen and used over pasta another time. The lasagne can be assembled up to 1 day ahead and left to cool completely. Cover, unbaked, and refrigerate up to 1 day in advance, or freeze, unbaked, up to 3 weeks in advance. Defrost overnight in the refrigerator; bake as directed below.