1. Heat the oven to gas 6, 200°C, fan 180°C. Put the spinach into a colander and pour over a full kettle of just-boiled water and allow to wilt. Put the spinach into a muslin or tea towel and squeeze as much water out as possible, then roughly chop and set aside.
2. Heat the oil in a large frying pan and fry the onion over a medium-high heat for 8-10 mins until soft, then add the chicken mince and fry for 6-7 mins until cooked through, browned and any liquid has evaporated. Add the garlic and courgettes and cook for 3-4 mins until the courgette liquid has evaporated; season well and remove from the heat.
3. Put the spinach, ricotta, 40g Parmesan, lemon and nutmeg into a clean bowl and mix together.
4. Put a third of the courgette mixture into a 1.2ltr (15 x 25cm) baking dish and top with a third of the ricotta, then lay over a third of the pasta to cover. Repeat twice more, ending in a layer of ricotta. Season well with black pepper and sprinkle over the remaining 10g of Parmesan.
5. Bake for 25-30 mins until golden and bubbling on top and serve with the green salad on the side.
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