Add two tablespoons of vegetable oil to your pan on a medium heat and add 2/3 onions to the pan until translucent. Try not to brown them.
Stir in the garlic and ginger paste and cook for 30 seconds.
Add your spices (madras powder, paprika, cumin, ground coriander, ground turmeric and Kashmiri chilli powder) along with your tomatoes sugar and mango chutney. Cook for 30 seconds.
Add half the stock and cook for 3-4 minutes. The curry should reduce a little. Repeat this step with the remainder of the stock.
Transfer to a blender and blitz.
Wipe your pan out and add one tablespoon of vegetable oil and the rest of your onions until translucent.
If you’d like to spice things up, add 2-3 chopped green chillis. If not, skip this step.
Stir in your tomato concentrate mixture and cook until the mixture starts to bubble.
Add your blended curry base back in and bring to a simmer and cook for 2-3 minutes.
Add your pre-cooked chicken. Tikka is best. Leave the curry to simmer for 2-3 minutes and stir occasionally. Remember to stir those flavoursome bits on the outside of the pan back into the curry.
Stir in your lemon juice and tamarind and cook for 1 minute.
Sprinkle in your kasuri methi. I tend to rub and sprinkle between my thumb and finger.
Garnish with chopped coriander.