Pineapple braised pork ribs

Ingredients

• 1 slab/rack of pork ribs, about 1.3kgs
• 1/2 cup soy sauce
• 1/2 cup vinegar
• 1/4 cup brown sugar
• 1 cup pineapple juice
• 1/4 tsp ground peppercorn
• 2 bay leaves
• 3 star anise
• 6 cloves garlic, minced
• 1/2 tsp grated ginger
• 2 cups water
• 2 tbsp oil
• sesame seeds or leeeks, for garnishing (optional)