POTATO GRATIN WITH PORCINI MUSHROOMS AND MASCARPONE CHEESE

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Potato Gratin with Porcini Mushrooms and Mascarpone Cheese image

Provided by Michael Lomonaco

Categories     Mushroom     Potato     Side     Bake     Christmas     Thanksgiving     Vegetarian     High Fiber     Casserole/Gratin     Cream Cheese     Parmesan     Christmas Eve     Bon Appétit     Sugar Conscious     Pescatarian     Wheat/Gluten-Free     Peanut Free     Tree Nut Free     Soy Free     No Sugar Added     Kosher

Yield Makes 8 to 10 servings

Number Of Ingredients 10

4 ounces dried porcini mushrooms*
1 cup boiling water
2 tablespoons (1/4 stick) butter
2 tablespoons extra-virgin olive oil
1/4 cup plus 2 tablespoons grated Parmesan cheese
1 1/2 cups mascarpone cheese** (from about 1 1/2 seven-ounce containers)
1 cup whipping cream
3 garlic cloves, chopped
Pinch of freshly grated nutmeg
2 1/2 pounds russet potatoes (about 5 large), peeled, cut crosswise into 1/8-inch-thick slices

Steps:

  • Place porcini and 1 cup boiling water in medium bowl. Place small bowl atop mushrooms to keep submerged. Let soak 20 minutes. Drain and coarsely chop mushrooms.
  • Melt butter with oil in medium skillet over medium heat. Add mushrooms and sauté until beginning to brown, about 3 minutes. Sprinkle with salt and pepper. Remove from heat. Whisk 1/4 cup Parmesan and next 4 ingredients in small bowl; season with salt and pepper. DO AHEAD: Mushrooms and cheese mixture can be prepared 1 day ahead. Cover separately and chill.
  • Preheat oven to 325°F. Butter wide shallow 2-quart baking dish. Arrange 1/4 of potato slices in bottom of dish. Sprinkle lightly with salt and pepper. Scatter 1/4 of mushrooms over. Repeat. Spread half of cheese mixture over, shaking dish to settle. Repeat with remaining potatoes and mushrooms in 2 layers each; spread remaining cheese mixture over. Sprinkle 2 tablespoons Parmesan over. Place gratin dish on rimmed baking sheet.
  • Bake gratin until top is brown and sauce is bubbling at edges, about 1 hour 15 minutes. Let gratin rest 15 minutes before serving. DO AHEAD: Can be made 2 hours ahead. Let stand at room temperature. Tent loosely with foil and rewarm in 300°F oven 20 minutes.
  • *Available in the produce section of many supermarkets and at specialty foods stores and Italian markets.
  • **Italian cream cheese; sold at many supermarkets and at Italian markets.

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