I have been looking at many posts. They mostly suggest frying the Onions.

I have been boiling and blending the onions to reduce the oil that rises to the top.

There are other tips and trade secrets that might help other readers.

Will try to help wherever possible

in exchange I need help with any unusual recipes ( not the usual Madras, Korma) that you have discovered . I intend to de-skill & simplify these recipes for all to enjoy

Mike