Sprinkle the aubergine slices with salt and leave to
drain in a colander for 30 minutes. Rinse well under
cold running water, drain and pat dry on kitchen
paper.
Brush the aubergine slices with oil and place
on 2 large baking sheets.
Roast the aubergines at
the top of a preheated oven, 200°C (400°F), Gas Mark
6, for 10 minutes on each side until golden and
tender.
Meanwhile, reheat the tomato sauce and keep
warm.
Spoon a little of the tomato sauce into a lasagne
dish and top with a layer of aubergines and some of
the Cheddar.
Continue with the layers, finishing
with the Cheddar. Sprinkle over the Parmesan and
bake for 30 minutes until the cheese is bubbling and
golden.