Separate the fish from the bones using your fingers. Shred the fish and set aside.
Heat the cooking in a large wok of frying pan.
Once the oil gets really hot, saute the garlic and onion.
Add the tomato and shredded fish. Cook for 2 minutes.
Stir-in the sliced okra. Cook in high heat for 5 to 10 minutes.
Add fish sauce and ground black pepper. Stir and cook for a 2 minutes.
Transfer to a serving plate. Serve with rice.