In a large frying pan, heat the oil until hot. (Test by dropping in a small piece of bread).
Drop in the cubed paneer slowly and cover the pan immediately with a lid because it will spatter.
Cook for 2-3 minutes and remove.
Put the cubed paneer into the bowl of water.
In the bowl of a food processor, add the coriander leaves, mint leaves,chillies, sweet chilli sauce, tomato puree, ginger, garlic, turmeric, cumin powder, coriander powder and brown sugar. Pulse till it becomes a smooth puree, You may need to add a tablespoon or 2 of water to get things moving.
In a large non stick frying pan over a medium heat, add 1 tbsp of the previously used oil.
Once hot, add the pulsed paste to the pan and heat for 1 minute before adding the green pepper and paneer.
Allow to cook for 6-7 minutes over a medium/low heat.