Rubs salt all over the fish including the cavity. Let it stay for 10 minutes.
Heat oil in a pan. Pan-fry both sides of the red snapper until it turns golden brown. Remove the fish from the pan, set aside.
Prepare the sweet and sour sauce by boiling pineapple juice. Add sugar. Stir until well blended.
Add ketchup and vinegar. Let the liquid re-boil.
Stir-in the garlic powder and then add the bell peppers and onion. Cook for 3 minutes.
Pour the cornstarch and water mixture. Stir. Cook until the texture reaches desired thickness.
Arrange the fried fish on a serving plate. Pour sweet and sour sauce on top.
Serve. Share and enjoy!