Make the White Sauce: Melt the butter in a saucepan, over a medium heat, add the flour, cook, stirring. Gradually whisk in the milk, continuously whisking until the mixture bubbles and thickens. Simmer, stirring, 2 minutes, season to taste.

Make the mushroom mixture: Add the mushroom to a bowl and pour over the boiling water, soak for 5 minutes. Drain, reserve liquid (for the meat mixture), then chop the diced mushrooms finely.

Preheat oven to 200°C. Heat the oil in large frying pan, add the onion, garlic and chorizo, over a medium heat, stir frequently until the onion is softened, but not coloured. Add the pork and cook until browned. Add the marsala, stock and reserved dried mushroom liquid, bring to the boil. Reduce the heat then simmer, uncovered, until reduced by about a third.

Line the bottom of a lasagne dish with the pasta sheets. Top with half the mince mixture then half the mushroom mixture, sprinkle with a 1/3 of the parmesan. Repeat with another layer, finishing with more pasta sheets. Spread with white sauce, top with sage, sprinkle with remaining cheese.

Bake, uncovered, for 30-40 minutes. Serve piping hot with lots of vegetables.