The food in the canteen smells disgusting. How did it come from?

1, using a diesel gas stove, the cooked dishes will have this taste when the fire floats into the pot because of too much firepower.

2. A tiny black substance is a pot debt. If the wok is not cleaned for a long time, a thick layer of pot debt will form inside. When cooking, there are pot debts formed by dry burning at the edge of the wok, and there will be black substances in the dishes when cooking. Usually, the first thing to cook in a hotel is to cook the pot, that is, to dry the pot and burn it red, and then clean it, so there will be no such pot debt.

Just these two kinds, by hand.