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Porcini-Potato Cake with Green Salad

  • ACTIVE: 1 HR
  • TOTAL TIME: 1 HR 30 MIN
  • SERVINGS: 6
  • VEGETARIAN

Dried porcini mushrooms—which cost about $50 a pound—and aged Gruyère cheese push an ordinary potato pancake into super-deluxe territory. "Sprinkle it with a bit of truffle salt, and it's off the charts," Grace Parisi says.

  1. 1 cup dried porcini mushrooms (1 ounce)
  2. 2 cups boiling water
  3. 3 tablespoons unsalted butter
  4. 2 medium shallots, very finely chopped
  5. Kosher salt and freshly ground black pepper
  6. 1 1/2 cups coarsely shredded Gruyère cheese (6 ounces)
  7. 4 pounds Yukon Gold potatoes, peeled and coarsely shredded
  8. 1 medium onion, finely chopped
  9. 1/2 cup extra-virgin olive oil
  10. 2 tablespoons fresh lemon juice
  11. 1 tablespoon walnut oil
  12. 6 ounces mixed baby greens, such as mesclun and arugula (12 cups)
  13. 1 cup grape tomatoes, halved
  14. Truffle salt (optional)
  1. In a small heatproof bowl, cover the dried porcini with the boiling water and let stand until the mushrooms are softened, about 25 minutes. Drain, rinse off any grit and finely chop the porcini mushrooms; discard the soaking liquid.
  2. In a medium skillet, heat 1 tablespoon of the butter. Add the chopped shallots and cook over moderate heat, stirring occasionally, until softened, about 4 minutes. Add the chopped porcini, season lightly with salt and black pepper and cook until fragrant, about 3 minutes. Let cool, then stir in the Gruyère cheese.
  3. Meanwhile, in a large bowl, toss the potatoes and onion with 1 tablespoon of kosher salt and let stand for 15 minutes. Working with a handful at a time, squeeze as much of the liquid as possible from the potato-and-onion mixture into a large bowl. Transfer the squeezed potatoes and onion to a work surface. Let the liquid in the bowl stand for 5 minutes to allow the potato starch to settle on the bottom. Pour off the liquid, leaving only the starch in the bowl. Return the potatoes and onion to the bowl and toss with the starch. Season generously with black pepper.
  4. Preheat the oven to 375°. In a 12-inch nonstick ovenproof skillet, melt the remaining 2 tablespoons of butter in 2 tablespoons of the olive oil. Remove from the heat. Add half of the potato-onion mixture, pressing it into an even layer with a spatula. Spoon the porcini-Gruyère mixture over the potatoes, leaving a 1-inch border all around the outside. Top with the remaining potato-onion mixture and press to seal the potato cake.
  5. Cook the potato cake over moderately high heat, shaking the pan occasionally, until the bottom is golden brown, about 7 minutes. Carefully slide the potato cake onto a large, flat plate. Invert the skillet over the cake and, using oven mitts or towels, carefully invert the cake back into the skillet. Drizzle 2 tablespoons of olive oil around the edges and cook the potato cake for 5 minutes. Transfer the skillet to the oven and bake the potato cake for 30 minutes, until it is cooked through and golden on the bottom. Slide the potato cake onto a plate.
  6. In a large bowl, whisk the remaining 1/4 cup of olive oil with the lemon juice and walnut oil. Season with salt and black pepper. Add the baby greens and tomatoes and toss again. Cut the potato cake into wedges and sprinkle them with the truffle salt, if using. Serve with the salad.
Make Ahead The porcini-potato cake can be made up to four hours ahead and reheated in a 350° oven.
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