Step 1

Heat the oil in a large frying pan over a medium heat. Add the garlic and fry for 1 minute, stirring, then add the onions. Cook for 5 minutes, then add the green chillies and tomatoes. Mix and cook for another 3 minutes.

Step 2

Stir in the spices and salt, then add the potatoes and 75ml/2½fl oz water. Lower the heat, cover the pan and cook for 3 minutes.

Step 3

Add the beans and cook for 15–20 minutes more, until the potatoes are cooked through. How long this takes will depend on the size of the beans and potatoes.

Step 4

Stir through the coriander just before serving.