Foie Gras in Buckwheat Salt Crust
Mix the buckwheat flour with the coarse salt, add the egg whites, then the buckwheat groats. Encase the foie gras, seasoned with pepper, in this buckwheat salt crust. Bake on a stone for about 20 minutes at 180°C, depending on thickness. Leave the foie gras to rest in its crust for 10 minutes.
Mushroom Broth
Place the sliced mushrooms in a saucepan, add the Champagne and water. Season with salt, bring to a boil, then bake in the oven for 12 hours at 70°C. Strain and reduce the broth by half. Add the sobacha, cover, and steep at 90°C for 7 minutes.
Buckwheat Lace Crumble
Mix the buckwheat flour with the wheat flour, add salt, oil, and thin with water. Cook lace-thin sheets in a very hot pan, blot on a paper towel, then crumble coarsely.
The Eryngii
Place the eryngii mushrooms and the crushed garlic clove on a sheet of foil, season with salt, and add the Champagne, mushroom broth, and pepper. Close the foil 'en papillote' and bake for 10 minutes at 170°C. Leave to rest in the papillote outside the oven for 10 minutes, then slice.
The Artichokes
Toast the buckwheat groats in the oven at 180°C for 7 minutes and set aside. Trim the artichokes and sear them in olive oil. Add diced carrot and celery along with chopped onion, sweat, then deglaze with Champagne. Reduce and add the mushroom broth and buckwheat groats. Cover and bake at 180°C for 20 minutes, then rest at room temperature.
Artichoke Purée
Trim the artichokes, slice, then sauté quickly in olive oil. Deglaze with a quarter of the mushroom broth, reduce while coating the artichoke pieces, then add the rest of the broth halfway up the sides. Cover with parchment paper and bake for 35 minutes at 160°C. Purée, then whisk in butter and adjust seasoning.
Plating
Open the buckwheat salt crust, remove the foie gras, and slice it. Spread some artichoke purée along the rim of a shallow plate and sprinkle with toasted buckwheat. Slice the eryngii and baby artichokes. Arrange them next to the foie gras, then pour over the sobacha mushroom broth. Finish with a scattering of buckwheat lace crumble.
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