- Heat the oil in a large frying pan or wok and add the onion, carrot, celery and garlic. Fry for 3 minutes.
- Add the beef and pancetta and fry until the mince is no longer pink.
- Add the rosemary, bay leaves, maple syrup, water, stock cube, tomato purée and tomatoes. Bring to the boil and then turn down to simmer for 15 minutes. Remove the bay leaves and rosemary.
- Make the white sauce by mixing the milk and cornflour together. Add the cheese, butter and salt and pepper. Heat in a small saucepan and gently bring to the boil. The sauce should thicken. Set to one side until needed.
- Preheat the oven to 180ºC/200ºC/gas 7.
- Grease a large casserole dish and layer the meat sauce, lasagna sheets and white sauce. Repeat. You should have enough mixture for 2 layers each with a layer of meat sauce on the top.
- Mix the breadcrumbs and parmesan together and sprinkle over the top.
- Place in the oven for 35 minutes. Turn the oven down to 160ºC fan oven/180ºC\gas 5 and cook for a further 15 minutes. The top should be browned and crunchy and the pasta tender.