Hong Kong Pork Stew

• 2 tomatoes in (cut)
• 1 green pepper in (cut)
• 525 gr pork shoulder cubed (boneless)
• 400 gr pineapple chunks (canned)
• 290 gr sweet potatoes
• 60 ml molasses
• 60 ml vinegar
• 55 gr firmly packed brown sugar
• 16 gr cornstarch
• 3 gr salt