Heat a glug of the oil in a frying pan or wok over a medium heat and add the spices, garlic, half of the sliced onion, half of the chilli and the coriander stalks. Stir-fry for 1 minute, making sure the garlic doesn’t brown. Add the sprout tops and stir-fry for 2 minutes. Sprinkle in the toasted gram flour and cook for a further 5-8 minutes, stirring occasionally, until the vegetables are cooked through. Add 2-3 tbsp of water to loosen the mixture.