Place the foie gras in a 6 x 3 ½-inch (15 x 9 cm) terrine dish and cover with foil. Place the terrine in a larger baking dish. Add enough hot water to fill the baking dish halfway up the terrine. Bake for 1 hour and 20 minutes or until a meat thermometer inserted in the centre of the terrine, without removing the foil, reads 130°F (55°C).