Like i said, im not quite sure what the guy meant.. Id be very surprised if there wasnt any sugar in spices even trace elements (some spices are very sweet). But somehow id guess it was his way to describe a process that helps release the natural oils found in the spices.
The techniques used in indian cooking are designed to release the flavours trapped inside the spices, the roasting of spices is to help bring out the oil. I once wrote that if you are going to roast your spices then do them individually.. On the basis that each spice takes different levels of time to get to the point of releasing it oils then it makes sense that if you put all your spices in one pan and heat them then you will get some spices releasing their oils before others have even started.
The bhoona process (frying of spices) is to remove the raw spice taste and thats the hardest part imo. If you add raw spices to base sauce which has oil added then they will cook without the risk of burning (if the heat isnt too high), seems when the spices stick to the bottom of the pan they can make the curry bitter, the same when raw spices come into contact with hot pan or a hot grinding blade on an electric grinder then they can also burn.
Im sure the extra heat of a pan full of curry on fire helps release some oil in the spices...(although how much extra heat you would get is hard to say, the hottest part of the flame is at the top, not the best way to add heat to a liquid substance) but i would think a lower simmer over a longer period of time helps extract all full flavours (as what you might expect from an oven cooked curry in an caserole dish), some of my best curries have been left to simmer on a low back burner.
What might happen when the pan is on fire, is that the sugar in the onions is caramelising producing a sweeter flavour not the spices. Im sure your average chef doesnt understand the exact physics behind the technique but he sure knows what tastes best.
The techniques used in indian cooking are designed to release the flavours trapped inside the spices, the roasting of spices is to help bring out the oil. I once wrote that if you are going to roast your spices then do them individually.. On the basis that each spice takes different levels of time to get to the point of releasing it oils then it makes sense that if you put all your spices in one pan and heat them then you will get some spices releasing their oils before others have even started.
The bhoona process (frying of spices) is to remove the raw spice taste and thats the hardest part imo. If you add raw spices to base sauce which has oil added then they will cook without the risk of burning (if the heat isnt too high), seems when the spices stick to the bottom of the pan they can make the curry bitter, the same when raw spices come into contact with hot pan or a hot grinding blade on an electric grinder then they can also burn.
Im sure the extra heat of a pan full of curry on fire helps release some oil in the spices...(although how much extra heat you would get is hard to say, the hottest part of the flame is at the top, not the best way to add heat to a liquid substance) but i would think a lower simmer over a longer period of time helps extract all full flavours (as what you might expect from an oven cooked curry in an caserole dish), some of my best curries have been left to simmer on a low back burner.
What might happen when the pan is on fire, is that the sugar in the onions is caramelising producing a sweeter flavour not the spices. Im sure your average chef doesnt understand the exact physics behind the technique but he sure knows what tastes best.