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Preheat the oven to 180°C fan-forced.
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Heat the olive oil in a large heavy-based pot over medium-high heat. Add the beef mince and cook, breaking it up with a spoon, until browned.
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Add the onion, garlic and chilli and cook for 3–4 minutes, or until softened.
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Stir through the tomato paste, oregano, mustard powder, cinnamon stick, basil leaves, salt and pepper. Cook for 1 minute until fragrant.
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Pour in the passata and beef stock. Add the parmesan rinds if using and bring to a gentle simmer. Reduce the heat and cook for 30 minutes, stirring occasionally, until the sauce has thickened slightly. Remove the cinnamon stick and parmesan rinds before assembling.
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While the sauce is simmering, prepare the eggplant. Slice the eggplants lengthways into thin strips, approximately 5mm thick.
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Place the slices on a tray, sprinkle with the salt and set aside for 10 minutes.
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Heat a large grill pan or frying pan over medium-high heat. Brush the eggplant slices lightly with olive oil and cook in batches for 2–3 minutes on each side, or until softened and lightly golden. Set aside.
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To make the béchamel, melt the butter in a medium saucepan over medium heat. Add the flour and whisk continuously for 1 minute.
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Gradually pour in the milk, whisking constantly until smooth. Continue whisking until the sauce thickens and coats the back of a spoon. Season with salt, pepper and nutmeg if using. Remove from the heat.
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Spread a thin layer of beef sauce over the base of a large baking dish.
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Top with a layer of lasagna sheets.
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Add a layer of beef sauce, followed by a layer of grilled eggplant, a spoonful of béchamel and a sprinkle of mozzarella.
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Repeat the layers until all ingredients are used, finishing with a final layer of lasagna sheets.
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Spread the béchamel over the top and sprinkle with the mozzarella and parmesan cheese.
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Cover tightly with foil and bake for 30 minutes.
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Remove the foil and bake for a further 15 minutes, or until golden, bubbling and lightly browned on top.
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Remove from the oven and allow the lasagna to rest for 10–15 minutes before slicing and serving. Enjoy with Family and Friends!