Gently score one side of the foie gras with a crisscross pattern using a paring knife, then evenly sprinkle seasoning over it. Mix the sauce ingredients, taste, and set aside for later use.
Use a 3-inch round cookie cutter to cut the brioche into rounds, then spread mushroom truffle sauce on them. Place the brioche rounds in the oven and broil them until golden brown.
Heat the pan over high heat until hot, add 2 teaspoons of oil, and sear the duck liver for 40 seconds on each side.
Place the brioche on a plate, then layer the duck liver on top. Drizzle the sauce around the brioche, and it's ready to enjoy.
Notes
Ingredients - Click to enlarge the imageTips and notes1 The pan must be properly heated before cooking the duck liver. If it's not hot enough, the duck liver can easily become overcooked.2 Avoid overcooking the duck liver, as it will lose its tender, melt-in-your-mouth texture.3 If brioche is not available, you can substitute it with a French baguette.4 if truffle sauce is not available, you can replace it with butter