Honey-mustard Turkey Meatballs

• 1 turkey (ground)
• 1 egg (lightly beaten)
• 300 ml unsweetened pineapple juice
• 170 gr butter-flavor cracke (crushed)
• 90 ml dijon mustard divided
• 55 gr mozzarella cheese (shredded)
• 30 ml honey
• 34 gr green pepper (chopped)
• 30 gr onion (chopped)
• 8 gr cornstarch