Portobello Gratin Recipes

POTATO/PORTOBELLO GRATIN

Steps:

• Heat oven to 400 degrees and butter a 9 by 13-inch baking dish and set aside.
• Using a mandolin, V-slicer or the slicing attachment on a food processor, slice the potatoes approximately 1/8-inch thick. (If you don't want to slice all the potatoes at once, slice them one at a time and build the gratin as you go.) Create the first layer by laying the slices in overlapping rows. Once the first layer is down, season lightly with salt and pepper, then scatter with mushroom slices and a couple tablespoons of the cheese. (Don't over-do it on these layers, if you create a barrier between the adjoining potato layers, the gratin won't set.) Continue building layers until you're out of potatoes or out of room to build, but be sure to save 1/2 cup of the cheese for the top.
• Pour 2/3 cup of the half and half over the gratin then spread both hands over the surface and push down to work the air out from the layers. Add remaining liquid only if half and half does not come to the surface when you push down. Sprinkle the gratin with cheese, cover loosely with foil and place in middle of oven for 1 hour. Check for doneness by inserting the point of a paring knife straight into the gratin. If it goes through smoothly, remove the foil, return to oven, and turn on the broiler just long enough to turn the top golden-brown. Remove, and allow to sit at room temperature for 15 to 20 minutes before serving.

PORTOBELLO MUSHROOM GRATIN

Steps:

• Preheat the oven to 400 degrees F (200 degrees C).
• Melt butter in a frying pan over medium heat. Add leeks and celery root and cook for 10 minutes. Add mushroom pieces, 1/2 of the tarragon, and 1/2 of the chives; continue cooking until mushrooms give off liquid, about 6 minutes more.
• Meanwhile, combine bread crumbs and Gruyere cheese in a mixing bowl.
• Add flour to the frying pan with the mushroom mixture. Add cream in a stream and stir until it becomes an even color, about 3 minutes. Add 1/2 of the bread crumb mixture and stir until cheese starts to melt, about 2 minutes. Turn off heat. Transfer mixture to a baking dish and top with remaining tarragon, chives, and bread crumb mixture. Add a small amount of water to moisten the mixture.
• Bake in the preheated oven until the cheese is bubbly, about 10 minutes.
• Use a spatula to scoop portions and serve immediately.

PORTOBELLO 'STEAK' AU POIVRE

Steps:

• Brush the mushrooms all over with olive oil. Sprinkle the pepper evenly over the gill sides (about 1/2 teaspoon per mushroom). Heat a large cast-iron skillet over medium-high, then add the mushrooms gill side up and sear until the underside is browned and the gill side looks wet, 3 to 6 minutes. Flip and cook until golden and the pepper is fragrant, 2 to 4 minutes.
• Reduce heat to medium-low. Flip the mushrooms so they're gill side up, then add the butter and garlic, and season with salt. While stirring the garlic to keep it from scorching, tilt the skillet to spoon up the melting butter and baste the mushrooms until tender, 2 to 5 minutes. Transfer the mushrooms to a plate, leaving the butter in the skillet.
• Add the shallot and stir until softened, 2 to 4 minutes, adding a little more butter if the pan is dry. Stand back, and carefully add the Cognac. (It might flame.) Stir until the Cognac has nearly evaporated. Add the heavy cream and mustard, season with salt, and stir to combine. Return the mushrooms to the pan gill side down, and cook until the cream is thickened and the color of a latte, 2 to 4 minutes. Eat the mushrooms with a drizzle of the sauce.

INDIVIDUAL PORTOBELLO MUSHROOM GRATINS

Steps:

• Preheat the oven to 350°F. Lightly oil a rimmed baking sheet. Arrange the portobello caps, gill sides down, on the sheet. Bake until tender, 20 to 25 minutes. Transfer to a plate to cool. Preheat the broiler.
• Stir together the cheese, bread crumbs, 1 tablespoon parsley, 1 tablespoon chives, and 1 tablespoon oil; set aside.
• Chop the portobello stems into 1/2-inch pieces. Heat the remaining tablespoon oil in a large skillet over medium heat until hot but not smoking. Add the shallots; cook, stirring, until softened, about 2 minutes. Add the sliced mushrooms and chopped stems; cook, stirring occasionally, until tender, 6 to 7 minutes. Add the wine; cook until most of the liquid has evaporated, about 2 minutes. Stir in the cream, remaining 2 tablespoons each parsley and chives, and the salt and pepper. Remove from heat.
• Arrange the portobello caps, gill sides up, on a clean baking sheet. Divide the mushroom mixture and then the crumb mixture among the caps. Broil until bubbling and golden brown, about 2 minutes.

ROASTED PORTOBELLO AND POTATO GRATIN

Steps:

• Heat oven to 400 degrees. Line a baking sheet with sides with a sheet of parchment. Place mushrooms gill side up on parchment. Thinly slice 3 garlic cloves, and scatter over mushrooms. Place a thyme sprig on each mushroom, drizzle caps with olive oil, salt and pepper, and place in oven until soft and releasing liquid, 10 to 15 minutes. Remove, and allow to cool. Keep oven on.
• Heat 1 tablespoon butter in a skillet, add onions, and sauté over medium-low heat until soft and beginning to color. Add cream and milk, scald, and remove from heat. Use remaining butter to grease a 9-inch gratin dish about 2 inches deep. Rub dish with remaining garlic clove.
• Remove and reserve garlic from mushrooms. Discard thyme. Slice mushrooms 1/2 inch thick.
• Peel and thinly slice potatoes. Place 1/3 of the potatoes in gratin dish, season with salt, pepper and nutmeg, scatter with half the reserved sliced garlic. Arrange half the mushroom slices on top. Repeat layers. Layer last third of potatoes on top. Season with salt and pepper. Pour scalded milk and cream with onions on top. Strew bread crumbs on top.
• Place gratin dish on a baking sheet, and place in oven. Bake about 1 hour, until potatoes are tender and liquid has thickened. If top browns too fast, tent with foil. Allow to stand 10 minutes, then serve.

POTATO AND PORTOBELLO MUSHROOM GRATIN

Steps:

• Combine 1 1/2 cups hot water and porcini in small bowl. Let stand until mushrooms soften, about 30 minutes. Drain, reserving 2/3 cup soaking liquid. Chop porcini; set aside. Remove and chop stems from portobellos; place in large bowl. Using small spoon, scrape away dark gills from portobellos and discard. Cut portobello caps into 1/2-inch pieces; add to bowl.
• Heat 3 tablespoons olive oil in heavy large skillet over medium-high heat. Add chopped portobello stems and caps and sauté 4 minutes. Stir in garlic and reserved porcini and sauté until mushrooms are tender, about 10 minutes. Season with salt and pepper. Remove from heat.
• Preheat oven to 375°F. Coat each of two 13x9x2-inch glass baking dishes with 1 tablespoon oil. Combine remaining 7 tablespoons oil, potatoes, parsley, thyme, rosemary, salt and pepper in large bowl; toss to coat. Layer 1/6 of potato mixture in each prepared dish (there will not be enough to overlap slices). Top potatoes in each with 1/4 of mushroom mixture. Repeat layering. Top with remaining potatoes. Pour 1/3 cup reserved porcini soaking liquid over potatoes in each dish. Cover dishes with foil.
• Bake gratins 45 minutes. Uncover and bake until tops are brown and potatoes are tender, about 40 minutes longer. (Can be prepared 2 hours ahead. Let stand at room temperature. Cover with foil and rewarm in 350°F oven about 20 minutes.)
• *Dried porcini mushrooms are available at Italian markets, specialty foods stores and many supermarkets.