Season fish with salt and pepper.
Coat fish with cornstarch.
Heat pan with cooking oil.
Fry fish for 6 minutes each side.
Once fish is cooked, transfer to a plate and set aside.
On a separate pan, heat oil and sauté garlic, ginger and onions.
Once onions are translucent, add in carrots and stir fry.
Add in bell peppers.
Season with salt and black pepper.
Pour in vinegar, water, sugar and ketchup. Mix well.
Mix in oyster sauce.
In a small bowl, dissolve ½ tbsp. cornstarch in 2 tbsp. water.
Pour in cornstarch mixture and mix well.
Simmer for a few minutes.
Remove from heat and pour the cooked sauce over the fried fish.
Serve and enjoy.