Make four stacks or mounds of overlapping potatoes in the pan and press them down.
Sprinkle with salt and pepper and cook gently until the bottoms are golden brown. Turn and cook the other side until it is browned.
Place the potato cakes on a baking tray lined with parchment paper and put them into a warm oven.
Season the foie gras with salt and pepper.
Prepare a nonstick frying pan over high heat then place the foie gras slices in the pan and cook for about three minutes on each side.
To serve, place the potato cakes onto warm plates and place slices of the foie gras on each one.
Make a sauce by pouring the vinegar into the pan and bring to a boil, scraping the pan as you do to encourage all the meaty flavor to be transferred to the sauce. Pour over the foie gras and garnish with the chives.
For a gastrique sauce which would make it a sweet and sour finish, mix step nine with the fruit coulis after it is finished.
Method Two:
After peeling or washing potatoes, boil them until tender.
Mash the potatoes the way you like best.
Add a little milk or cream and butter.
Make stacks of mashed potatoes that match the width of your foie gras.
Place the potato stacks on a baking tray lined with parchment paper and keep warm in the oven.
Prepare foie gras as above and continue with the potato stacks as above.
Serve with the fruit coulis.
How To Make The Fruit Coulis
Place the fruit in a food processor or blender and process to a smooth purée.
For a particularly smooth coulis, press the purée through a fine sieve to remove the seeds.
Stir in the lemon juice, and sweeten to taste with the sugar.
Add a little fruit liqueur if you wish.
If the sauce is too thick simply add a little water.