Thoroughly clean the fishes and season with salt. Marinate for an hour and pat dry.
Fry the fishes until golden brown and set a side. Pat with clena paper towel to remove excess oil.
Sauté garlic, onion and onion chives in olive oil. Add the tomatoes, water and ground black pepper. Cover the pan and adjust heat to medium low.
Mashed the tomatoes using the back of your wooden spoon when soft. Add the stalks of the mustard leaves and sauté for another 3 minutes.
Pour in water and let it simmer for 5 minutes. Add in the fishes and the mustard leaves and let it simmer for another 5 minutes.
Pour in the eggs and gently mix when the eggs start to cook. Season with fish sauce to taste.