1. In a large pot, heat some oil over medium heat. Add the chopped onion and minced garlic, and sauté until fragrant.
2. Add the pork ribs to the pot and brown them on all sides.
3. Pour in the soy sauce, salt, and black pepper. Stir well to coat the ribs.
4. Add the taro chunks and water. Bring to a boil, then reduce the heat to low and simmer for about 1.5 hours, or until the ribs are tender and the taro is cooked through.