Tray lasagne

To make the cheese sauce, melt the butter in a medium saucepan over low heat. Add the flour and cook, stirring, for 1 − 2 minutes or until it comes away from the sides of the pan. Gradually add the milk and cook for 10 minutes, stirring until thick and smooth. Add the cheeses and stir until melted and smooth. Cover and set aside.

For the mince mixture, heat half of the oil in a large, heavy-based saucepan over high heat. Cook the mince in batches until browned, breaking up any lumps with a wooden spoon, about 8 − 10 minutes. Set aside.

Add the remaining oil to the pan with the onion, garlic, bacon and oregano and cook until the onion is soft, about 5 − 8 minutes. Return the mince to the pan, add the wine and cook for 1 minute. Stir in the purée, reduce the heat to low, cover and cook for 50 − 55 minutes, stirring occasionally. Remove the cover and cook until thickened, about a further 15 − 20 minutes. Set aside to cool slightly.

Preheat the oven to 180°C.

Arrange 3 sheets of pasta in the base of a 4-litre capacity baking dish and top with a quarter of the mince mixture. Repeat with the remaining pasta and mince. Top with the cheese sauce and bake until the top is golden, about 1 hour.