Celery and Apple Stuffed Flounder Fillets

Ingredients

• 2 cups (500 mL) coarsely chopped celery
• 1 cup (250 mL) diced red apple (unpeeled)
• ¼ tsp (1 mL) garlic powder
• ¼ tsp (1 mL) onion powder
• ¼ tsp (1 mL) oregano leaves, crushed
• Pinch ground black pepper
• 1 lb (450 g) flounder fillets
• 1 cup (250 mL) orange juice
• 1 tbsp (15 mL) cornstarch
• ¼ cup (50 mL) cold water