Prepare all your ingredients before starting. Chop all vegetables into uniform sizes - about 1-inch cubes for potatoes, ½-inch for carrots, and similar-sized pieces for bell peppers.
Set your stove to medium heat (katamtamang init, 350°F/175°C). Pour oil into a large pan or kawali. Wait until the oil is hot but not smoking (Initin ang kawali sa katamtamang init).
Add your chopped onions and minced garlic to the hot oil. Cook them until the onions become clear and soft, about 2-3 minutes. Stir occasionally to prevent burning (Igisa ang sibuyas at bawang).
Increase heat to medium-high (375°F/190°C). Add the ground pork to the pan. Break up the meat into small pieces using your sandok or wooden spoon. Cook until the meat turns light brown, about 8-10 minutes.
Pour in the fish sauce and continue cooking for 2 minutes, stirring to distribute the flavor (Ilagay ang patis at haluing mabuti).
Add the diced tomatoes to the pan. Cook them until they become soft and release their juices, pressing them gently with your spoon (Ilagay ang kamatis at lutuin hanggang lumambot).
Pour in the water and bring the mixture to a boil. Once boiling, reduce heat to low (300°F/150°C) (Ilagay ang tubig at pakuluin. Pababain ang init kapag kumukulo na).
Add the cubed potatoes, carrots, and raisins to the pan. Cover and let simmer for 10-12 minutes, or until the vegetables are tender when pierced with a fork (Ilagay ang patatas, carrot at pasas. Takpan at palambutin).
When the potatoes and carrots are almost tender, add the diced bell peppers. Cook for another 3-4 minutes until the peppers are crisp-tender (Ilagay ang mga siling pangsigang kapag malambot na ang patatas at carrot).
Taste your dish and season with salt and pepper as needed. If the sauce is too thin, simmer uncovered for a few more minutes until it thickens to your liking (Timplahan ng asin at paminta. Kung malabnaw ang sarsa, pakuluan ng hindi nakatakip).
Turn off the heat and let the dish rest for 5 minutes before serving. This allows the flavors to settle and the sauce to thicken slightly.
Serve hot over steaming white rice (Ihain na mainit kasama ng kanin).