Place the sweet potato in a pan of boiling water and cook for about 5 minutes (so it is only partly cooked and still firm), drain off the water.
Heat the oil in a large saucepan and fry the onion and garlic until soft. Add the curry paste (may need a little water) and cook, stirring for 3 minutes.
Add the partially cooked sweet potato, prawns (defrosted first if required) and chickpeas and mix well.
Add the coconut, if using. When the coconut has melted add the spinach. Mix well.
Cover and simmer for 15-20 minutes.
Serve.
Servings 0
* Percent Daily Values are based on a 2,000 calorie diet. Your daily value may be higher or lower depending on your calorie needs.