Scatter a quarter of the mozzarella and Parmesan on top, then lay half the aubergine slices on the cheeses. Spoon a third of the remaining tomato sauce on top, then add the sheets of lasagne ...

Arrange a third of the aubergines on top and 3–3½ sheets of lasagne (you may need to break the lasagne into pieces to make it fit in an even layer). Repeat so you have three layers of sauce and ...