Codfish with vegetables au gratin - Riberalves

Ingredients

• 800 g of deep-frozen soaked cod loins Riberalves
• 500 g of straw fries
• 100 g of grated cheese
• 2 carrots
• 1 leek
• 2 large onions
• 8 dl of béchamel sauce
• 0.5 dl of oil
• Nutmeg q.s.
• Salt and pepper q.s.