Prepare your foie gras your way. It is especially important to add salt and pepper.
On all sides!
Wrap in a layer of stretch film (microwave safe).
Place it in a vacuum bag.
Vacuum seal it with a bell jar or small vacuum machine.
And There you go !
If you have a probe immersion heater, heat the bath to 56.5°C. When the temperature is reached, plunge the foie gras.
Leave in for 50 minutes. Without air, the livers do not float.
The lid must be on during cooking.
Once cooked, plunge the livers into an ice water bath.
Chill for at least 3-4 days before eating.
The advantage of this cooking is that you keep the shape of the foie gras.