Bring a large pan of water to a rolling boil and drop all the spinach into it. As soon as it wilts, drain in a colander and run cold water over it. Set aside to drain for another 5 minutes. Do not try to squeeze any more water out of it.

Put the tomato, spinach, fresh coriander, green chillies and dried fenugreek leaves into a blender in the order listed and blend until smooth. Set aside.

Pour the oil into a medium, non-stick frying pan and set over a medium heat. When hot, add the onion and fry for 7-8 minutes, or until soft and golden. Add the ginger and garlic and continue to stir-fry for another 2-3 minutes. The onion should pick up a little colour. Stir in the chilli powder, ground coriander, cumin and turmeric. Now pour in the mixture from the blender, adding the salt, cheese and 120 ml/4 fl oz water. Stir and bring to a simmer, then cook over a low heat for about 10 minutes, stirring gently now and then.