Sprinkle iodized salt evenly on the squid rings to taste.

Heat 1 tsp of cooking oil in a non-stick pan over high heat.

Stir-fry the squid until cooked through.

If using a non-stick wok, heat 2 tbsp of cooking oil.

Stir-fry the squid vigorously in the wok.

Add the chopped onions to the pan and cook until transparent.

Add the chopped garlic and cook briefly.

Dissolve the all-purpose flour into the cold water.

Pour the flour and water mixture into the pan.

Heat the mixture until the water evaporates.

Reduce the heat to medium.

Add the ground black pepper and mix well.

Pour in the cooking oil and fry, stirring continuously.

Mix in the green onions and serve immediately.