The ingredients
• 4 cod fillets
• 75 g / 1/3 cup Bordier lemon-olive oil butter
• 10 cl / 3 1/3 fl. oz. olive oil
• 500 g / 17 oz. potatoes
• 15 cl / 5 fl. oz. milk
• 10 cl 3 1/3 fl. oz. whipping / single cream
• 20 cl / 6 ¾ fl. oz. fish stock
• 1 small shallot, diced
• 6 branches lemon thyme