Meanwhile, place the prawn heads in a saucepan, add just enough water to cover and bring to the boil. Simmer for 5 minutes, then strain and reserve about 250ml of the stock. Cook the pasta in a ...

Turn up the heat and add the prawns. Cook for 2-3 minutes until they turn pink and are cooked through. Remove from the heat. Add the spinach, pasta, basil and lemon juice. Toss together ...