Top bolognese with cheese (¼ of grated cheese). Repeat steps 1-4 three more times, but don’t put the cheese on the top most layer right away. (Layer 1: lasagna sheets, bechamel, bolognese, cheese; layer 2: lasagna sheets, bechamel, bolognese, cheese; layer 3: lasagna sheets, bechamel, bolognese, cheese; layer 4: lasagna sheets, bechamel and bolognese.) Bake 15 minutes.