Lister, you should have seem my first attempt at a BIR curry

. I am not even going to begin to describe it

We all have the occasional disaster much to our annoyance so don't be too down hearted. You're already learning from it which is paramount and will lay firm foundations for regular future success

The base will never give up its oil if you use too little and if you don't add enough water to thin it to the desired consistency. Your attempt may have one or both of these problems. BUT your base was sweet so you have achieved what many fail to do early in the journey - cooking the onions correctly, so give yourself a pat on the back. Sugar added to a dish that is not a sweet dish, CTM, korma etc or a sweet and sour type dish (pathia) or a dish full of chilli powder should be a no no. Any sweetness should IMHO be available from the base unless you are after adding another layer of flavour and not simply looking to add sweetness to the curry ie, adding mango chutney or using jaggery, both adding much more than simply sweetness.
As for the blandness or lack of depth of flavour I would put this down to you not being able to reduce and caremalise your base becasue it was too thick in the first place. I do not agree that
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maybe you over cooked the spices, they only needs frying for about a minute.
I could easily be wrong and I look to the more experienced cooks on here to share their experiences on this matter. IMO you either undercook the spices, cook them correctly or burn them. However, I have asked myself the question, can you overcook the curry to the point where the flavours stop improving and start to degrade

Maybe this a separate topic which we can all contribute to
