floydmeddler,
as a general rule i find it best to stick to the original recipe on the 1st go exactly to spec - thereafter u can tweak it to your personal taste if u need.
after quite a few iterations this is what i've ended up using: veg oil 4 tbsp, onion 4 tbsp, green pepper 4 tbsp, garlic either 2 cloves or 1 htsp garlic/ginger paste, spice mix kushi 2 tsp, black pepper 0.25 tsp, salt 0.25 tsp, base 300ml, 3 off green chilli sliced (i remove the seeds but depends how hot u need), fresh coriander 1 tbsp.
i leave out the curry powder (ruins the dish) although i find rajah better than the supermarket brands.
i only mention leaving out the tom puree as i've tried adding it and it ruins the dish.
best wishes,