Put all the onions, garlic, optional chillies and ginger in a food processor with 3 tbsp of water.
Blitz until you have a paste like consistency.
Spray your large pan with frylight. *Make sure you use one that has a lid.
Cook the onion paste on medium heat without a lid. Stirring for 3-4 minutes.
Now add the spices and seasoning.
Stir while frying for 3 minutes, ensuring until the paste is golden throughout.
Add the tomatoes and 300ml water.
Cover and bring to the boil.
Add the chicken and lemon juice and cover again while cooking on medium heat while stirring from time to time for 25-30 minutes.
You may need to add water as it should thicken during this time.