De-vein the foie gras by separating the lobes and removing the veins, keeping the lobes as intact as possible.
Rinse out the jars with armagnac.
Season the lobes of foie gras, then pack them into the jars without damaging them. Fill a large saucepan with water, bring to the boil and immerse the jars, keeping them under the water (with a weight) for 45