Had about one and a bit portions of base left in the pressure cooker after knocking up a quick base yesterday and walking down the stairs this morning noticed how the house had the aroma of a takeaway

the Wife also noticed it without me mentioning it and I commented it was the gravy left in the pressure cooker which she then lifted the lid to have a sniff,'' close '' she said '' but not quite the same'' she then went on to say she thought the aroma came from the base being 'fried' when making the main curry so I put half a ladle of base in the pan and cooked it down to near nothing

The aroma around the house was caramelised onions with a hint of spices,there was just about a teaspoon of caramelised base left in the pan which I had to taste and

what a flavour ! It was delicious ! Very powerful flavour of fried onions and spices,I'm sure if you could get some of this flavour into your curries it would be a considerable improvement

Thinking about how curries are usually started with oil then g/g plus spice mix, chili powder and tomato paste I don't know if once you add the first ladle of base you could cook this mixture down to the point of caramelising without burning the mixture

Hope this might help in some way to get that savoury flavour we're looking for
PS, you could start your curries with a half ladle of base and cook this down before starting with the oil and this is how our local t/a make their curries with their ' all in one ' base but without the oil.