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Heat olive oil in a medium heavy based saucepan to medium heat.
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Add onion, carrot and celery and sauté until softened but not colored. Add garlic and sauté for a further minute.
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Add beef mince and sausage meat, increase heat to medium-high and sauté until moisture evaporates and meat is browned - ensuring all meat is broken up into small pieces with wooden spoon.
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Add white wine and reduce to a third.
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Add tomato paste and cook for 1 minute.
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Add tomato passata, bay leaves, salt and pepper to taste. Bring to the boil and lower heat to a simmer. Simmer for one hour, adding water if necessary.
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Preheat oven to 400°F.
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Meanwhile, to make the béchamel cheese sauce, melt the butter in a medium heavy based saucepan over medium heat. Add the flour and whisk to make a smooth paste. Cook until very lightly colored and sandy in texture.
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Add the milk very slowly, whisking constantly until a smooth consistency is achieved.
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Bring to the boil and simmer, stirring constantly, for 2 minutes. Set aside, stirring occasionally to prevent a skin forming (or place a sheet of clingfilm over the surface).
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To assemble the lasagna, grease a lasagna tray with olive oil. Place a small ladle of the bolognese at the base of the tray and place sheets of pasta down to cover the base and top with a ladle of bolognese followed by a drizzle of the béchamel sauce and a sprinkle of mozzarella and parmesan.
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Repeat previous step 3 times, finishing with a layer of béchamel and cheese.
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Cover the tray with aluminium foil and cook for 20 minutes.
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Remove foil and cook for a further 10 minutes or until cooked through. Test if cooked by pricking with a fork.
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Serve, garnished with chopped parsley.
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Hint: For perfect lasagna, make sure dry lasagna sheets are completely covered with meat sauce. Important to retain a high level of moisture.