Prepare the pork spare ribs by cutting it into 2x2 inch pieces. Marinate the ribs in the flour and shoyu for 30 minutes.
Drizzle some oil in a large pot. Over medium heat, add in the garlic and ginger. Quickly fry until fragrant. Add in the ribs and brown all sides.
Add in the rest of the ingredients except the pineapple chunks to the pot; vinegar, pineapple juice, brown sugar, and salt.
Cover the pot and let it simmer for an hour and a half. Then add in the pineapple chunks and let it simmer for another 30 minutes or until the ribs are fork tender.