- Preheat the grill to high.
- Heat the olive oil in a large frying pan over a medium heat. Add the onion, garlic and mushrooms and cook for 5 minutes until softened.
- Stir through the Merchant Gourmet Tomatoey French Lentils, chopped tomatoes and vegetable stock. Simmer gently for 10 minutes and season to taste.
- Meanwhile, make the cheese sauce. Melt the butter in a saucepan over a medium heat.
- Stir in the flour and cook for 1 minute until bubbling.
- Gradually whisk in the milk until smooth.
- Simmer gently, stirring regularly, until the sauce thickens. Stir through the Cheddar, nutmeg, salt and pepper, then remove from the heat.
- Lightly oil a baking dish. Spread a quarter of the lentil ragù over the base, followed by a quarter of the cheese sauce and a layer of lasagne sheets.
- Repeat the layers, finishing with a generous layer of cheese sauce.
- Scatter over the Parmesan and place under the grill for 4–5 minutes until golden and bubbling.
- Allow to stand for a few minutes before serving with a green salad.
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