Meanwhile, chop small the onion. Heat up a pan with 1 tbsp of oil. Fry the onions on medium to high temperature. Then, spread with 1-2 tbsps of sifted flour. The flour helps to take out the liquid. The sifting helps to prevent lumps. Mix with the onions very well and fry until brown, keep stirring. We do not have to wait until the onions are crunchy, all we need is this special roasting taste!