Potato Lasagna With Wild Mushrooms And Herb Sauce

Preparation

1. Step 1

   Preheat the oven to 300 degrees.

2. Step 2

   Peel and cut the potatoes into rectangular shapes, about 3 by 1½ inches.

3. Step 3

   Using a mandoline, a vegetable slicer or a sharp kitchen knife, slice each potato rectangle into 5 slices.

4. Step 4

   Line a cookie sheet with parchment paper and brush the parchment with the melted butter. Spread out the potato slices on a cookie sheet. Butter another piece of parchment paper and place, buttered side down, on the potatoes. Cook in the oven until the potatoes are soft, about 10 to 15 minutes.

5. Step 5

   Chop all the mushrooms. Heat 1 tablespoon of the butter in a saute pan and add the mushrooms. Cook over medium-low heat until they are soft. Add the finely chopped shallots and cook for 2 minutes more, or until the shallots are translucent.

6. Step 6

   In a medium-sized saucepan, melt 2 tablespoons of butter. Add the diced celery, leeks, shallots and onion. Saute for about 5 minutes. Add the wine and, over high heat, reduce the liquid until it almost totally evaporates. Add 1 cup of water, the garlic, thyme and lemon juice and reduce it by a fourth. There should be 6 ounces of liquid. Strain through a sieve, pressing on the vegetables to release the juices. While the liquid is hot, pour it into a blender. Whir the liquid, adding 8 ounces of butter tablespoon by tablespoon. Season the sauce with salt and pepper to taste. Pour the broth back into the pan and stir in the chopped parsley and diced tomatoes.

7. Step 7

   To serve, alternate slices of potato with mushrooms. Spoon the celery sauce over the potatoes and serve.