1- The evening before in a large salad bowl put the livers, the small lardons, the thyme, the bay leaf, salt and pepper (quite generously), pour the port, cover with plastic wrap and let marinate overnight in the refrigerator.
2- The next day drain the livers and lardons, discard the bay leaf and thyme and keep the port from the marinade separately.
3- In a sauté pan place a knob of butter and sear for 3 minutes the livers and lardons then remove them and pour the port from the marinade (deglaze) into the pan. Let reduce for 2 to 3 minutes and set the reduced port aside.
4- When the livers and lardons have cooled, pass them through a food mill with the finest grid, adding the port reduction.
5- In a blender or food processor put the liver mousse prepared this way, add the foie gras and cream, then salt (lightly), pepper, add a small pinch of nutmeg, mix for 30 seconds.
Transfer to a nice earthenware or porcelain terrine (if you have a few truffle slices, no one will say anything to you), cover
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