Step 1

Finely chop the onion and mince the garlic. Add to a heavy bottom pan on medium heat with 1 tbsp vegetable oil. Slice the leek into slices and add to the pan too. Let this cook for 5 minutes until the onion is translucent.

Step 3

If you prefer to peel the sweet potatoes, do this and then cut into pieces about 2 cm big. Add to the pan along with all the spices, tomatoes and water. Bring to a gentle simmer and leave for about 30 minutes,

Step 5

Check the potatoes with a knife and when almost soft and ready, drain the kidney beans and add to the pan. Leave this for a further 5 minutes.

Step 7

Take off the heat, squeeze in the juice of one lime and a big handful of coriander.