Sweet Potato, Black Bean and Chickpea Chilli

Ingredients

1. 600g sweet potato (peeled and cut in 1.5cm dice) [1lb 5oz]
2. 1 large red pepper (cut in 2cm dice)
3. 2 x 400g cans chopped tomatoes [2 x 14oz]
4. 2 x 400g cans black beans (rinsed and drained) [2 x 14oz]
5. 400g can chickpeas (drained) [14oz]
6. 250ml water [UK 8fl oz / US 1 cup]
7. 1 large onion (finely chopped)
8. 4 garlic cloves (crushed)
9. 1 tsp ground coriander
10. 1 tsp ground cumin
11. 1/2 tsp ground cinnamon
12. 1 to 2 tbsp chili powder (according to taste)
13. 1 tbsp cider vinegar
14. 2 limes
15. 2 tsp cocoa powder
16. 1 tsp caster sugar
17. 3 tbsp olive oil
18. Salt & pepper
19. 1 bunch fresh coriander to serve