Receta Tasty White Fish Casserole

• 1 lb white fish fillets
• 1¼ cups milk
• Salt and freshly ground black pepper to taste
• 1 tbsp sunflower oil
• ⅓ cup butter
• 1 medium onion, peeled and finely chopped
• 2 leeks, sliced
• 1 medium carrot, peeled and small diced
• 2 medium potatoes, peeled and cut into small pieces
• 6 tbsp all-purpose flour
• 1½ cups fish or vegetable stock
• 2 tbsp whipping cream
• 1 tsp freshly chopped dill
• Crumble topping :
• ⅓ cup butter
• ½ cup all-purpose flour
• ¾ cup grated Parmesan cheese
• ¾ tsp cayenne pepper

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