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Heat the oil in a large frying pan over a low-medium heat. Add the onion and a pinch of salt and cook slowly, stirring occasionally, until softened and just starting to colour. Add the garlic, ginger and coriander stalks and cook for a further 2 mins, until fragrant.
Add the spices to the pan and cook for another 1 min, by which point everything should smell aromatic. Tip in the chopped tomatoes and kidney beans in their water, then bring to the boil.
Turn down the heat and simmer for 15 mins until the curry is nice and thick. Season to taste, then serve with the basmati rice and the coriander leaves.