Cook the pasta, following the instructions on the packaging.
While the pasta is cooking, make the sauce.
Finely chop the onion, garlic and red pepper.
Heat a spoonful of oil in a large frying pan and sauté the onion and red pepper for 5 minutes.
Add the garlic and stir-fry for 30 seconds then add the spinach, lemon juice and a drop of water.
Put a lid on and cook for 3 minutes, until the spinach has wilted.
Add the prawns, but the lid on and cook for another 3 minutes, until the prawns just have changed colour.
Add the grated cheese, nutmeg, cayenne and salt to your liking. Add a ladleful of the pasta’s cooking water, then turn up the heat and stir gently until you get a creamy sauce.
Drain the pasta and add it to the prawn sauce.
Toss gently, then serve with plenty of pepper and some grated parmesan, if liked.