Pork shank confit with duck fat

1 Pork Shank: 700 grams to 900 grams per piece (French recipe) + 130 grams of sauce and duck fat recoverable to cook. Good for 2 to 3 people Packed under vacuum and individually. Can freeze. Simply warms in the pot or at low power microwave- Special offer: 369 Thb instead of 449