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Chop the tomato (no need to peel), dice the onion and peel and chop the sweet potato (about 1/2inch cubes in size) and place into a slow cooker along with the chickpeas.
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Add all the spices, ginger and garlic to the vegetables and pour in the coconut milk and vegetable stock.
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Turn the slow cooker on high for 3 hours until the sweet potato is nice and soft.
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The curry is not yet finished, a the cornflour mixed into about 2tbsp of water and stir into the curry, turn the slow cooker on high for a further 1/2 an hour so it can thicken, a few minutes before the end stir in the spinach so it can wilt but not over cook then serve.
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If you don't want to use a slow cooker you can do this in a pan, place all except the cornflour an spinach in a pan and cook on a medium heat for 30-45 minutes until the sweet potato is soft, stir in the cornflour to thicken then add the spinach, wilt and serve.

