Hi Curry queen and DarthPhall
I posted about the boil and blend technique because way back in 1987 When I believe I was the first to offer an Indian buffet , I used to notice that after 30 minutes or so , under the hot lamps the oil would rise to the Top, Not nice to look at !
All cuisine is born out of necessity; you can only eat what you can grow or use what is available cheaply. Onions don?t need much looking after and can therefore be grown cheaply. However there are many in India who for spiritual or health reasons avoid Garlic and onions. (And Coffee /tea/alcohol)
Our cuisine, Gujarati, does not use an onion base at all!
And the sauces are watery and thin. I assume that in the British climate which is always cold, a few more calories and the customer?s desire for value for money (Something chunky!) led the restaurateurs to use Onions ---Cheap, to bulk out the curries. I have even heard of some using boiled spuds or starches to thicken the sauce!
Try making a curry without the Onions. Or even use a puree of leftover Carrots, celery, any hard vegetable! Would love feed back from people on this.
My belief is that a good chef should not be a slave to a recipe but innovative and make something out of what is available. There are many recipes that are results of accidents or improvisations---the chocolate chip cookie is a good example!
Most Indian veggies dishes are made without Onions ?at least in Gujarat which is the fussiest and most difficult of all Indian Cuisines ?More on this later.
As for the Aromas, my feelings are that it is the coriander and Fenugreek that provide the fragrant notes in the smell. Cloves & Cinnamon if used whole will also give lovely aroma. Rice cooked, steamed with a couple of cloves is lovely to smell!
Please remember spices have spores( diseases) modern fumigation and irradiation counter this , but do what the Indians do, use the Vaghar /Baghar / Tarkari technique---Fry the onions in hot oil , sterilise the spices and diffuse the aromas within the oil to which the main ingredients are added.
Mike