Soak the lobes of foie under cold running water, remove the nerves, season and marinate them. Put them in a jar and pack them well.
4
You can add a dash of cognac, armagnac or other brandies.
5
Seal tightly the jar with the first cap to allow proper sterilization.
6
Put the lid at last, not too tight.
7
If you prepare many jars, repeat the process with each one of them. Don't forget to put the cap and the lid. The former to sterilize, the latter to seal the jar.
8
Put then in a large pot with a board at the bottom to prevent them from sticking during the sterilization phase. Cover with cold water.
9
Bring to a boiling point and keep cooking for 20 to 30 minutes.
10
Let it cool in the sterilizing water. Keep refrigerated.