In a medium to large saucepan, heat the oil and fry the onion for 3 minutes, add the garlic, Meatless Mince, nutmeg and herbs and fry for 5 minutes until mince is browned, constantly stirring.
Add mushrooms, chopped tomatoes, tomato puree, marmite and stock, cook for a further 15 minutes. Season to taste after the filling has cooked. If using a pasta sauce add when the meat has been browned
Preheat the oven 190˚C/170°C Fan/Gas Mark 5
Melt the butter in a pan over a low heat, remove from the heat, add the flour, stirring until smooth, gradually blend in the milk stirring constantly and return to the heat until the sauce comes to a gentle boil.
Add 50g of the cheese and the mustard and season to taste
To layer; place a small amount of bolognese sause on the base of 2 litre ovenproof dish, layer 3 sheets of the lasagne, top with ½ the remaining bolognese and ¼ sauce, top with 3 sheet s of lasagne, repeat, top with the remaining sauce, sprinkle the top with the remaining grated cheese and a sprinkle of Parmesan if using.
Cook in the oven for 40 – 45 minutes until golden on top and gently bubbling