Marinate labahita cubes in calamansi juice, iodized or rock salt and pepper for 30 minutes.
Coat each piece with cornstarch, then fry in oil until golden brown. Set aside.
Saute onion and garlic in oil. Add water, sitaw, puso ng saging, eggplant and atsuete juice.
Season with salt, pepper and sugar according to taste. Simmer for 20 minutes.
Add the rest of the ingredients except fish.
Simmer, stirring occasionally, until pechay is cooked.
Add fish just before serving. Serve with sauteed bagoong alamang.