Preheat the oil in a saucepan over medium heat and fry the peppers for about 5 mins until softThen add the spring onions, Thai curry paste, chopped coriander and chilli and stir fry for 1min until fragrant.Add the coconut milk and chicken stock and cook until it starts to simmer before reducing the heat. Simmer for 2 mins.Add in the prawns and simmer for 3-4 mins until the prawns are defrosted and warmed through.Stir in the spinach and add fish sauce to taste and serve over rice, a sprinkle of crispy shallots and some fresh coriander.