Wash the fish and rub with salt.
Heat oil in a pan. Fry the fish until golden brown. Then, place in a plate after frying.
In the same pan, heat 1 tablespoon cooking oil and sauté garlic, ginger, and onion. Then add tomatoes and stir until tomatoes are cooked.
Add the black pepper, water, vinegar, and sugar. Cover and simmer for 5 minutes.
Then, put the carrot and bell pepper. Cook for about 5 minutes.
Add the diluted cornstarch. Stir and cook for 5 minutes.
Get the fried fish and pour over the sauteed sauce.
Serve while hot!