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Fill a large pot of water and bring to the boil.
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Preheat the oven to 200 degrees
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While the water is heating up, finely dice the onions, chop the parsley, grate the zucchini, slice the mushrooms and grate the cheese.
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Melt the butter in a large fry pan then add in the onion, stir until the onion is tender and translucent.
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Once the water is at boiling point add a large pinch of salt, then add the pasta and cook until al dente.
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Add the drained tuna to the butter and onion, stir and then add the zucchini and sliced mushrooms.
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Stir in cream cheese, tomato paste, manrub and just bring the sauce to the boil (avoid over cooking it as it will dry out)
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Remove from heat and stir through the strained pasta, ¾ of the parsley and cheese (leaving some to sprinkle on top.
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Pop the pasta mixture into a large oiled baking dish, sprinkle with Man grind, breadcrumbs and remaining cheese.
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Bake until browned and crispy on top.
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Sprinkle with parsley and serve!