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Heat the olive oil in a large frying/sauté pan on medium heat and cook the onions until soft, not browned.
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Add in all the mushrooms – it will look like there is far too much in the pan but have faith! They will soften and shrink and cook down at least by half their volume.
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Cook until the mushrooms have given up the liquid they naturally give off when you first apply heat to them (this can take 10 minutes as there are such a lot of ‘shrooms).
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Pop in you bay leaves and the garlic.
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Pour in the Marsala and let it sizzle just a little – you don’t want to evaporate off, you want the mushrooms to drink it up instead.
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Sprinkle on the stock powder and season with plenty of black pepper and a little sea salt.
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Stir in your fresh parsley then set aside whilst you make the sauce.
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In a medium sauce pan over a low-medium heat make a roux with the flour and butter (whisk together until thickened).
Add the milk in, a drop at a time, whisking constantly until it is all combined over a lowish heat – again, this may take 10 minutes or so.
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Off the heat, whisk in most of the parmesan (reserving rest to sprinkle on top before baking the assembled lasagne).
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Add the greek yogurt and grate over plenty of freshly grated nutmeg and a pinch of ground allspice, followed by more black pepper.
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Now to assemble – take a large ovenproof dish and layer up the white sauce, sheets of lasagne, mushroom mix, more white sauce etc finishing with the parmesan.
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If liked, grate over some extra nutmeg and pop the oven on 200˚C and cook for about 30mins until the pasta is soft, the filling cooked through and the top burnished and beautifully bronzed.