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They do use oil for this, they need it to bring out the fragrance!
May I know why you can't take oily food?

Of course you may know why my friend.
I have a very high hereditary cholesterol count.
Fried foods increases the count putting me in danger of a stroke.
So I have to be very careful of oils and even the foods that I eat.
Blessings!

Ahhh... I understand now. It's good that you are taking care of your food intake my friend!