On a hot skillet over medium heat, add oil. Saute garlic, onion and pork cubes. Sprinkle some salt and pepper to taste. Cook while stirring occasionally until half-cooked, about 15 minutes.
Add water, vinegar, soy sauce, bay leaf, and peppercorn. Do not stir. Turn down the heat. Simmer for about 20 minutes or until pork is done and the sauce has almost dried up.
Serve on a bowl or container.