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Spray or brush the sliced aubergine and courgette with olive oil, season then roast in a single layer in the centre of a preheated oven at 180°C for 20-25 minutes. They should be crisping around the edges and browning lightly. Put to one stand as you prepare the white sauce.
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Melt the butter in a small saucepan then add the flour, mustard powder, a good grating of nutmeg and plenty of black pepper and after a couple of minutes, start dribbling in the milk. Whisk or stir constantly until all the milk has been incorporated and the sauce thickens. This can take several minutes if using skim milk as there is a higher water:fat ratio and it needs to evaporate. Take off the heat when ready.
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Whisk the pesto into the tomato sauce.
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Take a small oven proof dish big enough to take your lasagne sheets and pour a third of the tomato sauce into the base. Layer up a third of the roasted veg and a third of the sweetcorn. Lay on top two sheets of pasta and then spread over a third of the white sauce and 2 tbsp of the mozzarella. Repeat this step twice more finishing with extra nutmeg and black pepper then top with the parmesan.
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Bake for 30 – 40 minutes at 180°C until the pasta is cooked and the top browned and bubbling. Stand for at least 10 minutes before serving.